# When is a dog ready to breed? Age, health checks and timing > A dog is ready to breed when she is at least two years old, has passed the health tests for her breed and has been cleared by a vet; the heat cycle only sets the days. What to check first and when to wait. Canonical: https://lucernel.com/guides/when-to-breed-a-dog Last updated: 2026-10-23 Type: Guide. Publisher: Lucernel. ## Short answer A female dog is generally considered ready to breed at 2 years old at the earliest, once she is fully mature, has had the health screening recommended for her breed and a pre-breeding vet exam that includes a brucellosis test. A first heat, which can come as early as 4 months, does not mean she is ready. The cycle decides the days of the mating; readiness decides whether to mate at all. - **Choose this if:** Check age, health tests and the vet exam first, then plan the heat with your vet. - **Choose the other option if:** Littero keeps the dog’s tests, heat dates and documents in one record, and shows the dates as ranges, so that the plan is written down before the mating. ## Side by side | | What to confirm | What the source says | | --- | --- | --- | | Age | At least 2 years, and fully mature | AKC articles give 2 years as a minimally appropriate age | | Hips and elbows | Certified results, not only a preliminary look | OFA gives preliminary hip screening from 4 to 23 months and will not certify a normal elbow until age 2 | | Breed-specific tests | Every test the breed’s parent club recommends | OFA’s CHIC certification requires all recommended screenings, with public results | | Vet exam | General health, vaccinations and a brucellosis test for the dam and the sire | AKC advises a pre-pregnancy exam that includes brucellosis testing | | Timing | Days chosen with your vet | Merck: exams and samples about every 2 days once heat starts | ## Age and maturity: more than the first heat A first heat is a sign of puberty, not of readiness. An AKC article quoting a University of Pennsylvania reproduction specialist says small dogs tend to have a first heat by 6 to 7 months, mid-sized dogs between 7 and 9 months and large breeds by 12 to 16 months, with some dogs cycling as early as 4 months and others not until over 2 years. On readiness, the same AKC article says responsible breeders wait until a bitch is fully mature and has had all appropriate health screening tests done, and that 2 years of age is generally considered a minimally appropriate age. A second AKC article says she should be at least 2 years old. The first article adds that bitches are generally at their most fertile and at least risk of complications between ages 2 and 4. ## Health tests come first The AKC says a female needs a thorough veterinary exam to confirm she is in good health, and health testing to make sure she is free of serious issues, such as hips, eyes, elbows and heart, that could be passed on. The sire should have had the same testing. Her vaccinations should be current, and before breeding the AKC recommends testing both dam and sire for brucellosis. Age and testing are linked. The OFA offers preliminary hip screening for dogs between 4 and 23 months, and says it will not certify a normal elbow until the dog is 2 years of age. Its CHIC program awards a number to a dog screened for every disease the breed’s parent club recommends, with the results public. The list of tests differs by breed, so check the list for yours. ## Quality, cost and commitment The AKC suggests asking whether the dog meets the breed standard, and says winning titles under several judges shows the quality to breed. It also lists the costs: health testing, the stud fee, veterinary care and food for the mother and puppies, puppy vaccinations and worming, and possibly a C-section. It asks breeders to be ready to keep puppies until suitable homes are found and to take a puppy or an adult dog back if an owner’s circumstances change. A local breed club mentor can help evaluate your female and suggest a sire. ## Timing the mating in her cycle Once a dog is ready, the cycle decides the days. The Merck Veterinary Manual says to discuss breeding with your veterinarian before the dog comes into season, and to tell the vet as soon as you see discharge, vulva swelling or attraction to male dogs. The vet will examine her and take blood or vaginal samples, usually every 2 days, and then recommend which days to breed. Merck notes that ovulation comes during estrus, about 2 to 3 days after the luteinizing hormone peak, and that estrus lasts about 9 days on average. The stages and how the hormone tests work are covered in the heat cycle and progesterone articles, so they are not repeated here. ## Records to have before the mating Our suggestion: keep the test results with dates, the vet exam, the heat dates and the pedigrees of both dogs in one place before the mating. For AKC litter registration, the puppies must be born to an AKC-registered dam mated to an AKC-registered sire of the same breed, and the litter must be registered before individual puppies can be. A written record also shows later whether the plan was followed, and it is what a buyer or a vet will ask for. ## When to wait Wait if she is under 2 years old, if any recommended test is missing or abnormal, if the vet has not cleared her, if you have no plan for the puppies or the costs, or if you are not sure you want to breed. Waiting costs a season, and your vet can help you decide. Call the vet at once if she seems unwell. Disclosure: Littero is made by Lucernel, the publisher of this article. ## Frequently asked questions ### How old should a female dog be to breed? AKC articles give 2 years as the generally accepted minimum and say she should be fully mature. Her first heat can come much earlier, at 4 to 16 months depending on size, and is not a reason to breed. ### Can I breed my dog on her first heat? Responsible breeders wait until the dog is fully mature and has completed health screening, which in practice means after her first heat. A first heat usually comes before the 2-year minimum. ### What health tests does a dog need before breeding? The AKC lists a vet exam and screening for hips, eyes, elbows and heart, plus a brucellosis test for both dogs. The tests for your breed are listed under the OFA’s CHIC program. ### When in the heat cycle should I breed? Around ovulation, which your vet pins down with exams and samples about every 2 days. Merck says ovulation comes 2 to 3 days after the luteinizing hormone peak. ### Is Littero available? See the official app page for current availability and pricing. ## Our pick: Littero, the plan written down before the mating Littero is a kennel record for breeders. Each dog has a profile with pedigree and history, test results, photos and papers stored as documents, and the heat cycle and progesterone results sit on a calendar with reminders for cycles, tests and vet visits. Pregnancy and whelping dates appear as ranges, never a single date. It does not decide whether a dog is ready; your vet and your tests do that. - Dog profiles with pedigree, tests and documents - Cycle calendar, progesterone chart and reminders - Reports for your vet and your own records [See how Littero works](https://lucernel.com/apps/littero) ## Sources (checked 2026-10-01) - [Merck Veterinary Manual (owners): Management of reproduction in dogs](https://www.merckvetmanual.com/dog-owners/reproductive-disorders-of-dogs/management-of-reproduction-in-dogs) - [AKC: Everything you need to know about dogs in heat](https://www.akc.org/expert-advice/dog-breeding/dogs-in-heat/) - [AKC: Get your brood bitch in top shape to give birth](https://www.akc.org/expert-advice/dog-breeding/breeding-brood-bitch/) - [AKC: So you want to breed a litter? What to know beforehand](https://www.akc.org/expert-advice/dog-breeding/so-you-want-to-breed-your-first-dog-litter/) - [AKC: Register your litter](https://www.akc.org/register/litter/) - [OFA: CHIC program](https://www.ofa.org/about/chic-program) - [OFA: Hip dysplasia](https://ofa.org/diseases/hip-dysplasia/) - [OFA: Elbow dysplasia](https://ofa.org/diseases/elbow-dysplasia/)