Canine Herpesvirus in Breeding Dams: A CHV-1 Exposure Protocol
Isolate early. Verify carefully. Protect the pregnancy. Protect the litter. Escalate neonatal concerns immediately.
If a pregnant or nursing dam is exposed to canine herpesvirus (CHV-1), isolate her the same day, call your reproductive veterinarian the same day if she is in the final three weeks of gestation, and keep her away from other pregnant dams and young puppies. Exposure does not equal infection, and no single test clears a dog. The highest-risk period runs from three weeks before whelping to three weeks after. Stokeshire Designer Doodles uses the written protocol below, available as a free PDF, and treats every medical decision as the veterinarian's call.
Most adult dogs meet CHV-1 without ever looking sick. That is exactly why it catches breeding programs off guard. A dam can pick it up from a quiet, healthy-looking dog at a grooming appointment in week seven, and the first sign is a puppy who stops nursing at four days old.
This is the protocol we wrote for our own kennel. It is an operational framework, not veterinary advice, and it is built to get your veterinarian into the case early.
What is canine herpesvirus, and why does it matter to breeders?
CHV-1 is an enveloped canine herpesvirus spread mainly through close contact with oral, nasal, or vaginal secretions. Dogs can shed it without appearing ill, and once infected, a dog can carry the virus in a latent state for life. For most healthy adults it is mild or silent.
The risk changes in two situations. A previously unexposed dam who is infected for the first time late in pregnancy may be at risk for fetal loss, stillbirth, weak newborns, or neonatal infection. And puppies in roughly their first three weeks of life are especially vulnerable, because the virus replicates well at the lower body temperatures newborns naturally run. In susceptible neonates the disease can progress very quickly and may be fatal.
The six-week CHV critical window
We call the period from three weeks before expected whelping to three weeks after it the CHV Critical Protection Window. Veterinary sources describe the same six weeks. The Merck Veterinary Manual identifies isolating pregnant dams from other dogs during this period, with good handler hygiene, as the most effective way to reduce risk to puppies.
During that window, our standard for every breeding dam, regardless of CHV history, is no shows, daycare, boarding, group training, unnecessary grooming appointments, dog-dense outings, or introductions to outside dogs, plus maternity housing separated from the general population.
What counts as a CHV exposure?
We activate the protocol when a bred, pregnant, or newly whelped dam has had direct contact with a dog confirmed CHV-positive; nose-to-nose, breeding, or close mucosal contact with a dog strongly suspected of active infection; contact with secretions from a potentially infected dog; close exposure to a dog developing unexplained respiratory, eye, or genital signs; exposure tied to an unexplained cluster of losses in another litter; or housing a veterinarian believes created meaningful exposure.
Exposure does not equal infection. It triggers containment and a veterinary call, not an assumption that the dam or litter is infected.
What to do in the first 24 hours after exposure
- Isolate. Move the dam to a dedicated space with no dog contact and no shared bowls, bedding, crates, grooming tools, toys, or whelping equipment. No shows, classes, boarding, daycare, or unnecessary waiting rooms.
- Keep a whelped litter with the dam. Do not separate nursing puppies unless the veterinarian directs it. Colostrum is an important source of passive antibody protection.
- Call the reproductive veterinarian the same day if she is in the final three weeks of gestation. Have ready her breeding date, gestational age, due date, exposure date, the source dog and its signs or test results, the type and length of contact, her current signs, and any prior CHV history or neonatal losses.
- Start the exposure record. Write it down now, while the details are fresh. The PDF includes a blank record.
How to read CHV test results
Testing may include PCR, which looks for viral DNA, and serology or serum neutralization, which looks for antibody. Cornell's Animal Health Diagnostic Center offers both. Because CHV can hide in a latent state and shedding can be intermittent, results only make sense in context.
| Result | What it can and cannot tell you |
|---|---|
| Negative PCR | Does not prove latent infection is absent. |
| Positive antibody test | Documents exposure. Does not by itself prove active shedding. |
| Negative antibody test | May identify a susceptible dog. Needs veterinary interpretation. |
| Paired or repeat testing | May be recommended when recent infection is suspected. |
Our rule: no single negative CHV test is treated as proof that a dog is permanently CHV-free. Testing decisions belong to the veterinarian and the diagnostic laboratory.
Managing the pregnancy after exposure
Keep the dam isolated through the observation period the veterinarian sets. In the final three weeks of pregnancy we keep her isolated regardless of later test results. Cut unnecessary stress: no travel, boarding, events, big environmental changes, or elective procedures unless medically necessary.
CHV cannot be diagnosed by ultrasound, but your veterinarian may use ultrasound or other fetal monitoring to follow viability. Call promptly for unexpected discharge, fever, respiratory or eye disease, pregnancy loss, premature labor, abnormal monitoring, stillbirth, or unusually weak newborns. Acute infection during pregnancy can cause loss even when the dam shows few signs.
What not to do
- Do not start medications on your own. There is no established breeder-administered protocol that clears CHV from an exposed dam. Any antiviral, antibiotic, steroid, or immune product must come from the attending veterinarian with her pregnancy considered.
- Do not pull puppies to bottle-feed simply because exposure occurred. That decision requires veterinary direction.
- Do not crank up the heat. Warmth matters, and Merck describes incubator management of exposed, asymptomatic littermates at about 95°F and 50% humidity in certain circumstances. That is a veterinary setting, not a whelping-box instruction. Excess heat carries its own risks, including dehydration and puppies unable to move away from the source.
- Do not import a foreign CHV vaccine. See the vaccination note below.
Neonatal red flags for canine herpesvirus
Every puppy in an exposed or suspect litter gets heightened observation for its first three weeks: birth weight, identification, nursing, daily weights, activity and tone, elimination, and any respiratory, eye, gastrointestinal, or neurologic change.
Treat these as urgent
- Failure to nurse
- Sudden decline in nursing strength
- Failure to gain weight
- Unexplained weight loss
- Persistent or unusual crying
- Lethargy or weakness
- Diarrhea
- Nasal discharge
- Eye discharge or swelling
- Abdominal discomfort or distention
- Rapid or difficult breathing
- Poor coordination
- Sudden collapse
- Unexpected neonatal death
Do not watch overnight. CHV in a susceptible puppy can move from apparent health to severe illness or death within about a day. Call the veterinarian or emergency service immediately.
If one puppy becomes sick, tell the clinic you suspect CHV before you arrive, treat the whole litter as exposed, keep it isolated from every other litter, and do not move puppies between dams without instruction.
If a puppy dies
Do not file an unexpected neonatal death under "fading puppy syndrome" by default. When CHV is possible, call the veterinarian before burying, cremating, or freezing the puppy. Necropsy with PCR is one of the most efficient ways to confirm or rule out CHV, and labs generally want fresh tissue refrigerated rather than frozen. Follow your lab's instructions. Keep whelping records, weights, maternal testing, medication records, and the exposure timeline together.
Can you breed a dam again after CHV?
A CHV exposure, a positive antibody test, or a prior CHV-associated loss does not automatically end a dam's breeding career. Previously infected dams generally develop an immune response that can pass maternal antibody protection to later litters through colostrum, and Merck notes that later breeding after an affected pregnancy is often successful. The decision should weigh her reproductive history, whether the diagnosis was confirmed, her current health, your veterinarian's advice, and your program's biosecurity. Stokeshire does not retire a dog solely because CHV antibodies were detected.
Is there a CHV vaccine?
As of September 2026, there is no licensed CHV vaccine in the United States. An inactivated vaccine, Eurican Herpes 205, is authorized in Europe. We do not recommend importing or administering a foreign CHV vaccine outside appropriate veterinary and regulatory channels. If you breed outside the United States, ask your veterinarian what is authorized where you are.
The Stokeshire CHV-1 Exposure Protocol
The full kennel protocol in a printable PDF, written for the maternity room wall and the case file.
- All 18 sections, from first exposure to return from isolation
- Testing interpretation guide and neonatal red-flag panel
- A blank CHV Exposure Record to fill in for every suspected case
- Personnel-flow order for handlers and visitors
Operational framework, not veterinary advice. Review with a veterinarian experienced in canine reproduction before adopting it as your kennel SOP.
Frequently asked questions
How long should a pregnant dog be isolated to prevent canine herpesvirus?
From three weeks before expected whelping through three weeks after, a six-week window. Veterinary guidance identifies this separation, with careful handler hygiene, as the most effective practical way to reduce CHV risk to newborn puppies. After a known exposure, your veterinarian sets any longer observation period.
Can a dog test negative for CHV and still carry it?
Yes. CHV can remain latent for life, and shedding can be intermittent, so a negative PCR does not prove latent infection is absent. Antibody levels can also dip. That is why one negative test is not treated as clearance, and why results should be read by your veterinarian.
Should I separate puppies from an exposed dam?
Not by default. Colostrum is an important source of maternal antibody, which is one reason puppies of previously exposed dams may be protected from severe disease. Keep the dam and litter together unless your veterinarian directs otherwise.
Is canine herpesvirus the same as fading puppy syndrome?
No. Fading puppy syndrome describes a pattern of decline with many possible causes. CHV is one specific cause. When a neonate dies unexpectedly and CHV is possible, necropsy with laboratory testing is the way to find out.
This article summarizes an operational framework for professional breeders. It does not replace examination, diagnosis, test interpretation, or treatment by a veterinarian or veterinary reproduction specialist. Primary sources: the Merck Veterinary Manual and Cornell University's Animal Health Diagnostic Center.
Description
A written, veterinarian-led response for canine herpesvirus (CHV-1) exposure in breeding dams.
Canine herpesvirus often causes little or no illness in adult dogs. The risk changes when a previously unexposed dam is infected late in pregnancy, or when newborn puppies are exposed in their first weeks of life.
This 12-page protocol is the framework we use at Stokeshire. It covers:
the six-week CHV Critical Protection Window
what to do in the first 24 hours after an exposure
how to read PCR and antibody results
neonatal red flags
whelping biosecurity
a blank CHV Exposure Record
Free. Your download link arrives by email at checkout.
Operational framework, not veterinary advice. Review with a veterinarian experienced in canine reproduction before adopting as your kennel SOP.
Isolate early. Verify carefully. Protect the pregnancy. Protect the litter. Escalate neonatal concerns immediately.
The first 24 hours
What counts as an exposure, how to isolate the dam, and exactly what to tell your reproductive veterinarian the same day.
Reading test results
What PCR and antibody results can and cannot tell you, and why no single negative test clears a dog.
Neonatal red flags
The signs that make a newborn puppy an emergency, and why you do not watch overnight.
The exposure record
A blank case record to complete for every suspected event, from exposure date to veterinary conclusion.
Inside the 12 pages
- The six-week CHV Critical Protection Window, three weeks before whelping through three weeks after
- Pregnancy management, whelping biosecurity, and handler personnel flow
- Why colostrum matters and why puppies stay with the dam by default
- What to do if one puppy becomes sick, or if a puppy dies
- Return from isolation, breeding status after CHV, and a prevention standard for every dam
- Current vaccine status in the United States
Who it is for
Professional breeders who want a written, veterinarian-led response ready before they need it. It is the protocol we use in our own program at Stokeshire Designer Doodles, Wisconsin Licensed Breeder #514401-DS.
Read the companion article: Canine Herpesvirus in Breeding Dams.
This protocol is an operational framework for professional breeders. It does not replace examination, diagnosis, test interpretation, or treatment by a veterinarian or veterinary reproduction specialist. Review it with a veterinarian experienced in canine reproduction before adopting it as your kennel SOP. Questions: hello@wisconsindesignerdoodles.com