Can a Puppy Grow Too Fast? The Science of Large-Breed Puppy Nutrition, Calories & Growing Pains
Stokeshire feeding philosophy
Can puppies grow too fast?
Yes. Excess energy intake can increase weight gain and growth rate during skeletal development. Veterinary research in large-breed puppies supports maintaining a lean body condition, avoiding overfeeding and unnecessary mineral supplementation, and targeting controlled rather than maximum growth.
We have placed hundreds of puppies. A very small number have gone on to develop significant developmental orthopedic problems during their first eighteen months of life.
In all three cases, the family had switched the puppy away from the food and feeding protocol we recommended.
That observation matters to us. But it is also important to say clearly what it does prove, and what it does not.
Three cases cannot establish causation. Developmental orthopedic disease is complex, and no responsible breeder should suggest that one brand of food, one ingredient, or one nutritional decision can explain every diagnosis.
What those cases did do was cause us to look much more closely at the veterinary literature on puppy growth.
What we found reinforced something we already believed:
A puppy's eventual adult size is largely determined by genetics. Feeding more calories does not create a genetically larger adult dog. It can, however, cause that puppy to reach portions of that growth trajectory faster, carry more body weight while the skeleton is immature, and place additional demands on developing bones and joints.
That distinction is the foundation of Stokeshire's feeding philosophy.
This is the long version of a conversation we have with families at go-home, and it is why every Stokeshire puppy leaves with specific feeding guidance.
What “Growing Pains” Actually Means
“Growing pains” is not a diagnosis.
In puppies, particularly medium, large, and giant dogs, the phrase is commonly used to describe several different developmental orthopedic conditions.
Panosteitis
Panosteitis, often shortened to “pano,” is an inflammatory condition affecting the long bones of growing dogs.
It is seen most commonly in young, rapidly growing medium, large, and giant-breed dogs and frequently presents as sudden lameness that may disappear from one leg and later appear in another.
The exact cause remains unknown. Genetics, growth rate, metabolic factors, stress, and nutrition have all been investigated as possible contributors. Cornell University describes panosteitis as multifactorial and specifically identifies rapid growth and possibly nutrition among the factors believed to play a role.
Fortunately, panosteitis is generally self-limiting and usually resolves as the dog reaches skeletal maturity.
Osteochondrosis and Osteochondritis Dissecans
Osteochondrosis is a developmental disorder in which normal cartilage-to-bone maturation is disrupted.
When abnormal cartilage separates or forms a flap within a joint, the condition may be referred to as osteochondritis dissecans, or OCD.
It most commonly affects rapidly growing medium and large dogs and may involve the shoulder, elbow, knee, or hock.
Unlike uncomplicated panosteitis, OCD can create permanent joint damage and in some cases requires surgical treatment.
The precise cause is also multifactorial. Veterinary references identify hereditary predisposition, rapid growth, excessive nutrition, trauma, and other biological factors as contributors.
Hypertrophic Osteodystrophy
Hypertrophic osteodystrophy, or HOD, is another painful developmental bone disease seen primarily in rapidly growing puppies.
It affects the metaphyseal regions near the growth plates and can cause significant pain, swelling, fever, reluctance to move, and systemic illness.
Its cause is not fully understood either. Nutrition may influence skeletal development generally, but HOD should not be reduced to a simple “too much calcium” or “wrong food” diagnosis.
These conditions are different diseases with different mechanisms and outcomes.
What they share is that they occur during a period when the skeleton is changing extraordinarily quickly.
That is why the way we manage growth matters.
Why Growth Rate Matters
A young puppy is not simply a miniature adult dog.
During the first year of life, bones lengthen, growth plates mature, cartilage remodels into bone, muscles develop, and joints adapt to rapidly changing mechanical forces.
Large puppies face an additional challenge: they have more growing to do in roughly the same amount of developmental time.
That creates a narrow margin between supplying enough nutrition for healthy development and supplying more energy than the growing skeleton can optimally accommodate.
Veterinary nutrition literature has repeatedly identified excess energy intake and overly rapid growth as important factors in developmental skeletal disease.
A UC Davis review of large-breed puppy nutrition concluded that overnutrition can produce both increased body weight and faster bone growth accompanied by abnormal bone remodeling.
The Merck Veterinary Manual similarly states that overfeeding during growth increases growth rate and that this is undesirable because it can interfere with proper skeletal development.
That is the part of puppy nutrition we believe deserves far more attention.
The question is not simply:
“Is this a good dog food?”
The better question is:
“How much usable energy is this puppy receiving during a period when its skeleton is still developing?”
Calories Matter More Than the Number of Cups
One of the easiest feeding mistakes is assuming that one cup of puppy food is nutritionally interchangeable with one cup of another.
It is not.
Different foods can contain very different amounts of metabolizable energy in the same measuring cup.
For example, the food currently used in the Stokeshire program, Diamond Naturals Skin & Coat Salmon & Potato, contains approximately:
Diamond Naturals Skin & Coat Salmon & Potato
408calories per cup
- Energy3,600 kcal/kg
- Protein25%
- Fat14%
Purina Pro Plan Sensitive Skin & Stomach Puppy Salmon & Rice
479calories per cup
- Energy3,976 kcal/kg
- Protein28%
- Fat18%
Diamond states that the formula meets AAFCO nutrient profiles for all life stages, including growth of dogs expected to reach 70 pounds or more as adults.
That means an owner who changes foods but continues feeding the exact same number of cups could unknowingly increase the puppy's calorie intake considerably.
Same measuring cup, different energy intake
Additional calories per day
+213
Additional calories per week
+1,491
Increase per measured cup
+17%
That is nearly 1,500 additional calories every week from what looks, to the owner, like the same amount of food.
For an adult dog, that difference may primarily affect body weight.
For a rapidly growing puppy, it can also affect growth velocity.
That does not mean the higher-calorie food is defective. It means portions must be recalculated when foods change.
Even Purina emphasizes that avoiding overfeeding and maintaining ideal body condition is especially important during puppy growth.
How to convert portions when you change foods
Match calories, not cups. The arithmetic is simple.
Current daily calories = current cups per day × current food's calories per cup
New cups per day = current daily calories ÷ new food's calories per cup
Example. A puppy eating 3 cups of Diamond at 408 calories per cup is receiving 1,224 calories a day. To hold that roughly constant on a 479-calorie food, divide 1,224 by 479. The starting equivalent is about 2.6 cups, not 3.
Adjust from there based on body condition, growth trajectory, activity, and veterinary guidance.
The comparison per 1,000 calories
Nutritionists compare nutrients relative to energy, not just as a percentage printed on the bag, because a puppy eats to meet an energy requirement. We compared not only the bag percentages but how much of each nutrient a puppy receives relative to total energy intake.
| Per 1,000 kcal | Diamond Salmon & Potato | Pro Plan Puppy Salmon & Rice |
|---|---|---|
| Food required | 278 g | 252 g |
| Protein | 69 g | 70 g |
| Fat | 39 g | 45 g |
| Calcium (label minimum) | 3.3 g | 2.8 g |
| Phosphorus (label minimum) | 2.8 g | 2.3 g |
Three things stand out. Protein per calorie is nearly identical, so the protein percentage on the bag is misleading on its own. Calcium per calorie does not explain the difference between the two foods, and on label minimums the Purina formula is actually lower. Energy density, and the fat that drives it, is the clearer practical distinction.
These figures use guaranteed analysis values, which are label minimums rather than measured averages. A typical analysis from each manufacturer would refine the calcium and phosphorus rows.
Not All Purina Pro Plan Formulas Are the Same
This is an important nuance.
Purina also manufactures a Large Breed Sensitive Skin & Stomach Puppy Salmon & Rice formula.
That product contains approximately 418 calories per cup rather than 479 calories per cup.
Calories per measured cup
That makes its energy density much closer to Diamond's 408 calories per cup.
Its fat level is also lower than the regular Purina puppy salmon formula.
So it would be inaccurate for Stokeshire to say:
“Purina Pro Plan makes puppies grow too fast.”
Purina Pro Plan is a family of different formulations.
What we can say is:
Some puppy formulas are considerably more calorically dense than others, and feeding them in equal cup quantities can materially increase daily energy intake.
That is exactly why we ask families not to change foods casually during the rapid-growth period and, when a dietary change is medically necessary, to evaluate the new food by calories and nutritional profile rather than simply replacing “one cup with one cup.”
What Experimental Research Tells Us
This is not merely theoretical.
Researchers have directly studied what happens when rapidly growing dogs receive different amounts of energy.
In one controlled study at the Hannover veterinary school, 27 Great Dane puppies from three litters were split into groups. One group was fed as much as it wanted, while the restricted groups received 80% or 70% of that amount.
The puppies consuming more energy developed higher concentrations of insulin-like growth factor 1, or IGF-1, an important biological signal involved in growth. The investigators connected intensive feeding with increased growth activity and skeletal developmental concerns.
That finding helps explain why Stokeshire focuses on the pace of growth, not merely whether the ingredient list looks attractive.
More nutrition does not necessarily mean better development.
What About Protein?
Another common belief is that high protein causes large puppies to grow too quickly.
The research does not support making that claim broadly.
Researchers specifically studied different protein levels in growing Great Danes while examining calcium metabolism and skeletal development.
They did not find evidence that higher dietary protein, by itself, produced abnormal skeletal development.
That matters because it prevents us from blaming the wrong nutritional variable.
When comparing two puppy foods, simply saying “this one has more protein” does not tell us whether it will create problematic growth.
Total energy intake, feeding quantity, body condition, calcium and phosphorus balance, genetics, and growth rate are more meaningful pieces of the picture.
Calcium Matters, But the Story Is More Complicated
Calcium does deserve special attention in growing large-breed puppies.
Unlike adult dogs, young puppies do not regulate excessive intestinal calcium absorption as effectively.
Experimental studies in rapidly growing large-breed dogs have demonstrated that excessive calcium intake can disrupt normal endochondral ossification and skeletal remodeling.
Modern veterinary guidance therefore cautions against excessive calcium supplementation in growing puppies, particularly large and giant breeds.
Calcium should be considered relative to energy intake, not merely as a percentage printed on the label. A puppy eats calories to satisfy an energy requirement, so nutrient exposure relative to calories is often more informative than comparing two bag percentages directly.
But there is an important distinction:
Excess calcium supplementation is not the same thing as saying that every developmental orthopedic condition was caused by the calcium concentration of a commercial puppy food.
Both Diamond Naturals Salmon & Potato and the Purina Pro Plan puppy formula discussed above carry AAFCO adequacy statements that include the growth of large-size dogs.
For that reason, Stokeshire does not claim that one appropriately formulated commercial food automatically causes orthopedic disease because it contains more calcium than another.
What we do strongly discourage is adding calcium, vitamin D, phosphorus, protein powders, bone meal, dairy products, mineral supplements, or other growth-oriented supplements to an already complete and balanced puppy diet unless specifically prescribed by a veterinarian.
Cornell makes the same recommendation for puppies at risk of panosteitis: feed an appropriate complete growth diet, avoid unnecessary calcium, vitamin D, and protein supplementation, avoid overfeeding, and maintain a lean body condition.
Why Stokeshire Recommends Controlled Growth
Our philosophy is straightforward.
We are not trying to create the biggest puppy at four months old.
We are not trying to make a puppy reach its adult frame as quickly as possible.
And we do not view rapid weight gain as proof that a puppy is thriving.
Our goal is a puppy that remains lean, adequately nourished, physically strong, and allowed to mature at an appropriate pace.
For most growing puppies, you should be able to feel the ribs easily beneath a light layer of tissue. The waist should be visible when viewed from above, and there should be an abdominal tuck from the side.
Stokeshire generally wants growing puppies maintained toward the lean side of ideal, commonly around a veterinary Body Condition Score of approximately 4 to 5 out of 9, depending on the individual puppy and veterinary guidance. That gives families a number to discuss with their veterinarian rather than a vague idea of “lean.”
A puppy carrying excess weight is not simply carrying more fat.
Every additional pound is being carried by joints, tendons, ligaments, growth plates, and bones that are still developing.
This is especially important in medium and larger Doodles whose genetic backgrounds may include Bernese Mountain Dogs, Golden Retrievers, Australian Shepherds, and Standard Poodles, breeds whose mature size means that skeletal development continues well beyond the earliest puppy months.
Why the feeding chart is only a starting point
The feeding chart printed on a bag is not a prescription for your individual puppy. It is a population-level starting point.
Two puppies of the same age and weight can have different energy requirements because of differences in genetics, expected adult size, activity, metabolism, environment, treats, training rewards, and body condition.
That is why Stokeshire asks families to look at the puppy, not only the measuring cup. A feeding amount is appropriate only if it is producing an appropriate body condition and growth trajectory.
The correct question is not “Am I feeding what the bag says?” It is “Is this amount keeping this puppy lean while supporting steady, appropriate growth?”
What Our Three Cases Mean to Us
We want to be careful here because responsible observation is different from scientific proof.
We have placed hundreds of puppies.
A very small number have developed significant developmental orthopedic problems during the growth period.
All three families had moved away from the feeding protocol we recommended.
That does not prove the food change caused the condition.
It does tell us that nutrition and growth management deserve to be taken seriously.
When an observation within our own program aligns with established veterinary evidence showing that overnutrition, excessive energy intake, rapid growth, inappropriate supplementation, and excess body condition can influence developing skeletons, we believe our responsibility is to communicate that information clearly.
Not fearfully.
Not as a guarantee.
And not by pretending the science is more certain than it is.
The Stokeshire Feeding Principle
If there is one principle we want every family to remember, it is this:
A complete and balanced food provides the raw materials.
Genetics provides the blueprint.
Your job is not to accelerate the construction schedule.
Your job is to give the developing body the nutrition it needs, maintain a lean body condition, provide appropriate movement, and allow the skeleton to mature without unnecessarily accelerating weight gain or growth through excess nutrition.
That is why Stokeshire recommends:
- feeding the food and portions provided at go-home unless there is a medical reason to change;
- measuring food rather than free-feeding;
- adjusting portions based on body condition rather than appetite alone;
- accounting for calories from treats, toppers, chews, and training rewards;
- avoiding calcium, vitamin D, mineral, and protein supplementation unless directed by a veterinarian;
- evaluating calories per cup whenever changing foods;
- making dietary changes gradually and with veterinary guidance when appropriate; and
- contacting us when a puppy's weight, appetite, gait, posture, or rate of growth changes unexpectedly.
Nutrition cannot eliminate every developmental orthopedic condition.
Neither can genetics, exercise management, or any single intervention.
But growth is one of the most biologically demanding periods of a dog's life, and nutrition is one of the few inputs families can control every single day.
At Stokeshire, we believe that responsibility should be approached with intention.
Healthy growth is not a race.
Frequently Asked Questions
Can a puppy grow too fast?
Yes. Excess energy intake can increase weight gain and growth rate during skeletal development. Veterinary research in large-breed puppies supports maintaining a lean body condition, avoiding overfeeding and unnecessary mineral supplementation, and targeting controlled rather than maximum growth.
What are growing pains in puppies?
Growing pains is not a diagnosis. In medium, large, and giant puppies the phrase usually refers to panosteitis, an inflammatory condition of the long bones that is generally self-limiting, or to less common developmental conditions such as osteochondritis dissecans and hypertrophic osteodystrophy. All three are multifactorial, and rapid growth is among the factors believed to play a role.
Does high-protein puppy food make puppies grow too fast?
Research does not support that claim broadly. In growing Great Danes fed the same calories at different protein levels, protein by itself did not produce abnormal skeletal development. Total energy intake, portion size, body condition, mineral balance, genetics, and growth rate are more meaningful than the protein percentage on the bag.
How much should I feed if I change my puppy's food?
Match calories, not cups. Multiply your current daily cups by the current food's calories per cup, then divide by the new food's calories per cup. Three cups of a 408-calorie food is 1,224 calories, which equals about 2.6 cups of a 479-calorie food. Adjust from there based on body condition, growth, activity, and veterinary guidance.
How do I know if my puppy is at a healthy weight?
You should be able to feel the ribs easily under a light layer of tissue, see a waist from above, and see an abdominal tuck from the side. Stokeshire generally wants growing puppies kept toward the lean side of ideal, commonly around a veterinary Body Condition Score of 4 to 5 out of 9, depending on the individual puppy and veterinary guidance.
Should I add calcium or supplements to my puppy's food?
No, unless a veterinarian prescribes them. A complete and balanced growth diet already supplies calcium, phosphorus, and vitamin D. Research in rapidly growing large-breed dogs suggests excess calcium can disrupt normal bone development, and young puppies do not regulate calcium absorption as effectively as adults.
Is Purina Pro Plan bad for doodle puppies?
No. Purina Pro Plan is a family of formulas with different energy densities. Some puppy formulas carry considerably more calories per cup than others, so feeding them in the same cup quantity can raise daily energy intake. The brand name is not the variable that matters most. The formulation, energy density, portion, body condition, and rate of growth are.
What food do Stokeshire puppies go home on?
Every Stokeshire puppy goes home on the food we feed across our program, Diamond Naturals Skin & Coat Real Salmon & Potato Formula. Its AAFCO statement covers all life stages including growth of large size dogs (70 lb or more as an adult). We recommend staying on it through the growth window. If you change foods, choose one whose AAFCO statement includes growth of large size dogs, and talk with us and your veterinarian first.
References
Cornell University College of Veterinary Medicine, Riney Canine Health Center. (n.d.). Panosteitis in dogs. https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-topics/panosteitis-dogs
Diamond Pet Foods. (n.d.). Diamond Naturals Skin & Coat All Life Stages Dog Salmon & Potato Formula [Product label and guaranteed analysis]. https://www.1800petmeds.com/dog/food/product/diamond-naturals-skin-coat-all-life-stages-salmon/prod63565.html
Dobenecker, B., Kienzle, E., Köstlin, R., & Matis, U. (1998). Mal- and overnutrition in puppies with or without clinical disorders of skeletal development. Journal of Animal Physiology and Animal Nutrition, 80(1–5), 76–81.
Hazewinkel, H. A. W., Goedegebuure, S. A., Poulos, P. W., & Wolvekamp, W. T. C. (1985). Influences of chronic calcium excess on the skeletal development of growing Great Danes. Journal of the American Animal Hospital Association, 21(3), 377–391.
Hazewinkel, H. A. W., van den Brom, W. E., van 't Klooster, A. T., Voorhout, G., & van Wees, A. (1991). Calcium metabolism in Great Dane dogs fed diets with various calcium and phosphorus levels. The Journal of Nutrition, 121(11 Suppl.), S99–S106. https://doi.org/10.1093/jn/121.suppl_11.S99
Hedhammar, Å., Wu, F.-M., Krook, L., Schryver, H. F., de Lahunta, A., Whalen, J. P., Kallfelz, F. A., Nunez, E. A., Hintz, H. F., Sheffy, B. E., & Ryan, G. D. (1974). Overnutrition and skeletal disease: An experimental study in growing Great Dane dogs. The Cornell Veterinarian, 64(2, Suppl. 5), 1–160.
Blum, J. W., Zentek, J., & Meyer, H. (1992). Über den Einfluß einer unterschiedlichen Energieversorgung wachsender Doggen auf Körpermasse und Skelettentwicklung. 2. Mitteilung: Einfluß auf den Insulin-like Growth Factor I und auf Schilddrüsenhormone [Influence of various levels of energy intake on development of body weight and skeleton in growing Great Danes. 2. Effects on insulin-like growth factor I and on thyroid hormones]. Journal of Veterinary Medicine Series A, 39(1–10), 568–574.
Larsen, J. (2010). Feeding large-breed puppies. Compendium: Continuing Education for Veterinarians, 32(5), E1–E4. https://pubmed.ncbi.nlm.nih.gov/20949422/
Meyer, H., & Zentek, J. (1992). Über den Einfluß einer unterschiedlichen Energieversorgung wachsender Doggen auf Körpermasse und Skelettentwicklung. 1. Mitteilung: Körpermasseentwicklung und Energiebedarf [Influence of various levels of energy intake on development of body weight and skeleton in growing Great Danes. 1. Growth rate and energy requirement]. Journal of Veterinary Medicine Series A, 39(2), 130–141. https://doi.org/10.1111/j.1439-0442.1992.tb00165.x
Nap, R. C., Hazewinkel, H. A. W., Voorhout, G., van den Brom, W. E., Lemmens, A. G., & Beynen, A. C. (1991). Growth and skeletal development in Great Dane pups fed different levels of protein intake. The Journal of Nutrition, 121(11 Suppl.), S107–S113. https://doi.org/10.1093/jn/121.suppl_11.S107
Nestlé Purina PetCare. (n.d.-a). Pro Plan Puppy Sensitive Skin & Stomach Salmon & Rice Formula dry dog food [Product label and guaranteed analysis]. Purina. https://purina.com/dogs/shop/pro-plan-salmon-rice-sensitive-skin-stomach-puppy-dry-dog-food
Nestlé Purina PetCare. (n.d.-b). Pro Plan Sensitive Skin & Stomach Puppy Large Breed Salmon & Rice Formula dry dog food [Product label and guaranteed analysis]. Purina. https://www.purina.com/dogs/shop/pro-plan-development-puppy-large-breed-salmon-rice-sensitive-skin-stomach-probiotic-dry
Sanderson, S. L. (2023). Feeding practices in small animals. In Merck Veterinary Manual. Merck & Co. https://www.merckvetmanual.com/management-and-nutrition/nutrition-small-animals/feeding-practices-in-small-animals
Schoenmakers, I., Hazewinkel, H. A. W., Voorhout, G., Carlson, C. S., & Richardson, D. (2000). Effect of diets with different calcium and phosphorus contents on the skeletal development and blood chemistry of growing Great Danes. Veterinary Record, 147(23), 652–660. https://doi.org/10.1136/vr.147.23.652
VCA Animal Hospitals. (n.d.). Feeding growing puppies. https://vcahospitals.com/know-your-pet/feeding-growing-puppies