Home / Breeding
Breeding a dog is a nine-week commitment that starts months before mating and runs until every puppy is weaned, vaccinated and settled in a checked home. This hub gathers our complete, source-checked guides on the whole journey: the heat cycle, confirming and following a pregnancy week by week, preparing for birth, and the look-alike condition, false pregnancy, that catches many owners out. Every guide is built from published veterinary and kennel-club guidance, and every guide tells you plainly where home care ends and veterinary care begins.
Breeding is optional. Doing it well is not. A litter should only ever be bred on purpose, from health-tested parents, with a veterinarian involved from the start. If a mating was accidental, skip to the accidental mating note below and call your vet today.
Responsible breeding begins long before a heat cycle. The American Kennel Club's guidance for breeders lists the groundwork: complete the health testing that is relevant to the breed for both the mother and the father, study the breed standard and the health history behind both dogs, choose a male for health and temperament rather than convenience, build a relationship with a veterinarian before you need one urgently, and prepare a safe, warm, quiet place for a mother to raise puppies for eight weeks. Add the unglamorous parts: a budget that survives an emergency caesarean, around-the-clock availability in the final week of pregnancy and the first days after birth, and confirmed homes for more puppies than you expect, because litter sizes surprise everyone.
If that list feels heavy, that is the point. Shelters and rescues are full, and the kindest outcome for many family dogs is not to breed at all. Our guide to the cost of spaying and neutering (costs package) covers the alternative, and your veterinarian can talk through the health side of that decision for your individual dog.
The four stages, proestrus, estrus, diestrus and anestrus, how long each lasts, what you will see, and how to keep an in-heat dog safe and unmated unless breeding is the plan.
The 63-day answer explained properly: why the count differs from mating and from ovulation, the normal 58 to 68 day window, and how vets pin down a due date.
The early, middle and late signs in order, which ones are reliable, which ones a false pregnancy can copy, and the tests a vet uses to confirm.
Our flagship guide: all nine weeks, what is developing inside, what changes you can see, and exactly what the owner should do each week.
Preparing the whelping box and kit, the three stages of labour, what normal delivery looks like, and the emergency signs that mean call the vet now.
Why a dog who was never mated can nest, produce milk and mother her toys, how long it lasts, what helps, and when it needs a vet.
Our free dog pregnancy calculator turns a mating date or an ovulation date into a due date, the full safe whelping window, and a dated week-by-week timeline with the key milestones marked: when an ultrasound can confirm the pregnancy, when an X-ray can count the puppies, and when to start taking temperatures. It is a planning aid, not a diagnosis, and the page explains the maths behind the 63 days.
Every breed carries its own list of recommended screening tests, covering things like hips, elbows, eyes, heart and DNA conditions specific to the breed. Testing both parents before mating is how breeders avoid producing puppies with preventable, painful inherited problems. Ask your veterinarian which tests apply to your breed, and ask to see the other dog's results in writing, not as a verbal promise. A breeder who will not show paperwork is telling you something important. Our breed profiles in the breed library describe the health issues each breed is known for, which is a good starting point for that conversation.
It happens through fences, doors and thirty seconds of inattention. Call your veterinarian the same day or the next morning. Depending on timing, vets can discuss options that range from letting a healthy pregnancy continue with proper care, to medical or surgical ways to end it, to spaying. Those options narrow quickly with time, so this is the one part of breeding where speed matters more than research. If the pregnancy goes ahead, the week-by-week guide and the calculator will help you prepare properly from wherever you are in the timeline.
Only after honest preparation: breed-relevant health testing for both parents, a veterinarian who knows the plan, homes lined up for every puppy, and the time and money for an emergency caesarean if one is needed. If any of those pieces is missing, the responsible answer is not yet, and spaying may be the better choice.
About 63 days counted from ovulation, which is roughly nine weeks. Counted from the day of mating the range looks wider, about 58 to 68 days for most dogs, because mating can happen several days before the eggs are actually fertilised.
Book a veterinary visit. Your vet can confirm the pregnancy at the right stage, usually with an ultrasound from around day 21 to 25 onwards, estimate dates, and set a feeding and monitoring plan. Signs alone cannot confirm a pregnancy, because a false pregnancy can look very similar.
Across all dogs the average litter is about five to six puppies, with a normal range of one to twelve. Breed and body size are the biggest factors. The only reliable count before birth is an X-ray once the skeletons have mineralised, from about day 45 and clearest after day 55.
Plan for health testing for both parents, progesterone or veterinary breeding management, pregnancy scans, extra food, whelping supplies, puppy vaccinations and microchips, and a reserve for an emergency caesarean, which is the single largest possible bill. Breeding done properly rarely makes money.
Call your veterinarian promptly, ideally the same day. There are time-sensitive options to discuss, and the earlier the conversation happens the more choices you have. Do not wait to see whether signs appear, because by then several of those options have closed.
This page is general information drawn from the published guidance of the organizations listed under Sources below. It is not veterinary advice, and it does not replace your own veterinarian, who knows your dog. Pregnancy and birth carry real risks for the mother dog and her puppies. If you are worried about a pregnant, whelping or nursing dog, contact your veterinarian or an emergency clinic straight away. For a poisoning emergency, the ASPCA Animal Poison Control Center is on (888) 426-4435 and the Pet Poison Helpline on (855) 764-7661. A consultation fee may apply on the helplines.
Last updated: November 2026. Facts on this page were checked against the sources listed above. How we work: our methodology.