Wondfo Canine Progesterone Guide: When to Breed for Best Results
Breeding Timing Reference
Wondfo Canine Progesterone Guide – When to Breed
Use this quick reference for progesterone levels and optimal breeding timing in dogs.
| Progesterone (ng/mL) | Meaning | Breeding Timing |
|---|---|---|
| < 2–3 | Baseline / early heat | Too early to breed |
| 2–5 | LH surge → ovulation approaching | Prepare for breeding |
| 5–15 | Ovulation zone | Start fertile window |
| 15–30 | Eggs mature & fertile | Prime breeding window |
| 30–50+ | Fertile window still open | Secondary breedings useful |
| > 50–60+ | Late cycle | Last chance to breed |
Planning your next breeding? The Wondfo Progesterone Rapid Quantitative Test is a powerful tool for breeders who demand precision and reliability. At Stokeshire, where excellence in genetics meets thoughtful care, we use quantitative testing to pinpoint the optimal window for breeding—ensuring every litter has the best possible start.
Whether you're using the Wondfo test at home or in a clinical setting, interpreting results correctly is key. Below, you’ll find our breeder-approved chart that translates progesterone levels into clear breeding milestones—compatible with results from Wondfo’s quantitative analyzer.
We also provide timing tips for natural ties, fresh and frozen AI, and surgical implantation—all in one beautifully simplified reference.
Bringing a new litter of puppies into the world requires more than intuition—it requires precision, science, and careful timing. For responsible breeders, canine progesterone testing has become the gold standard for determining the ideal breeding window, improving pregnancy success, and supporting healthier litters.
At the center of this process is progesterone, the key hormone that signals ovulation and fertility in the female dog. By tracking progesterone levels with a reliable tool like the Wondfo Canine Progesterone Test, breeders can move from guesswork to data-driven decision-making—maximizing success while minimizing stress for both the dam and the breeder.
This guide explains how progesterone works, how the Wondfo test functions, and how to interpret results to achieve optimal breeding timing.
Why Canine Progesterone Matters in Breeding
Progesterone acts as nature’s reproductive clock in dogs. It governs:
Ovulation timing
Uterine preparation for pregnancy
Maintenance of early gestation
A female dog’s heat cycle (estrus) involves a predictable sequence of hormonal shifts, but visual signs alone—such as swelling or discharge—are unreliable indicators of fertility. Progesterone levels provide the most accurate biological signal of where she is in her cycle.
How Progesterone Signals Ovulation
During early heat (proestrus), progesterone remains low. As the cycle progresses:
The Luteinizing Hormone (LH) surge occurs — triggering ovulation.
Progesterone begins to rise immediately after the LH surge.
Measuring progesterone allows breeders to pinpoint this transition with precision. This is why quantitative canine progesterone testing is far superior to relying on behavioral signs or historical cycle data.
How the Wondfo Canine Progesterone Test Works
The Wondfo Canine Progesterone Test is a fluorescent immunoassay that provides a precise numerical progesterone value (ng/mL), rather than a simple positive/negative result.
Step-by-Step Process
Blood Sample Collected — a small venous sample from the female dog.
Serum Separation — blood is centrifuged to isolate serum (hormone-rich liquid).
Test Preparation — serum is mixed with reagent and applied to a Wondfo test strip.
Analysis — the strip is inserted into the Wondfo Progesterone Analyzer, which reads the fluorescence and calculates the exact progesterone level.
This quantitative approach gives breeders a clear, objective measurement—eliminating uncertainty and enabling strategic breeding decisions.
How to Interpret Wondfo Canine Progesterone Results
While individual dogs vary, the following ranges are widely used by veterinarians and experienced breeders when interpreting Wondfo progesterone results. Keep in mind, every machine can be calibrated slightly differently.
Baseline: < 2–3 ng/mL (Not Fertile)
Early heat (proestrus).
Good time to establish a baseline (typically days 5–6 of heat).
Too early to breed.
LH Surge Zone: ~2–5 ng/mL
Indicates the LH surge has likely occurred or is occurring.
Ovulation is approaching.
Increase testing frequency (every 24–48 hours).
Ovulation Zone: ~5–15 ng/mL
Ovulation has just occurred.
Canine eggs are released but require ~48 hours post-ovulation to mature.
Many breeders prepare for first breeding shortly after this range is reached.
Prime Fertility Window: ~15–30 ng/mL
Eggs are now mature and ready for fertilization.
This is typically the best time for first breeding.
A second breeding 24–48 hours later often improves litter size and success.
Extended Fertile Window: ~30–50+ ng/mL
Eggs are still viable.
Secondary breedings can be beneficial if not already completed.
Late Cycle: > 50–60+ ng/mL
Fertility is beginning to decline.
Breeding can still work in some cases, but success rates generally drop.
Step-by-Step Breeding Timing Using Wondfo
Establish Baseline (Day 5–6 of heat)
Confirm progesterone is below ~2 ng/mL.
Test Every 24–48 Hours
Watch for the initial rise above 2 ng/mL.
Identify the LH Surge (~2–5 ng/mL)
Increase testing frequency.
Confirm Ovulation (~5–15 ng/mL)
Mark this day—ovulation has likely occurred.
Schedule First Breeding (2–3 Days Later)
Aligns with egg maturation.
Schedule Second Breeding (24–48 Hours After First)
Increases conception odds.
Final Confirmation (>15 ng/mL)
Confirms peak fertility and supportive uterine environment.
Benefits of Using the Wondfo Canine Progesterone Test
Breeders who adopt progesterone testing—especially with a reliable system like Wondfo—experience clear advantages:
Higher Pregnancy Success — eliminates guesswork in timing.
Larger, Healthier Litters — more eggs fertilized at peak fertility.
Less Stress for Dogs & Breeders — avoids unnecessary breedings or travel.
Valuable Breeding Data — helps track individual cycle patterns over time.
Long-Term Cost Efficiency — fewer missed cycles and failed breedings.
Why Choose Wondfo for Canine Progesterone Testing?
The Wondfo Canine Progesterone Test is widely used by breeders and veterinary clinics because it offers:
Quantitative results (not just yes/no)
Fast turnaround time
Consistency and reliability
User-friendly analyzer
Practical in-clinic or breeder setting
For breeders committed to precision, welfare, and excellence, Wondfo provides a dependable, science-backed tool for reproductive success.