You must make sure the bitch and the stud both are free from brucellosis before breeding them. Brucellosis causes eventual sterility in both sexes (sometimes non-obviously) and can cause a litter of puppies to be aborted or die shortly after birth. In addition, brucellosis is on occasion transmissible to humans via the urine or feces of an affected dog. Between dogs, it is most commonly passed in sexual intercourse, although an entire kennel can be infected through contact with secretions.
The sire should be in excellent general health. The dam must be in good health, to withstand the stresses and rigors of a pregnancy. They must both be up to date on their vaccinations.
Never breed any animal that has temperament problems. In particular, this has been the cause of the degeneration of many breed's general temperament: Doberman Pinschers, Rottweilers, and so on. If your animal is untrustworthy around people, overly aggressive to people, excitable, or is a fear-biter, do not breed it. If it is shy or submissive, don't breed it. Look for happy, confident and obedient animals, and consider carefully the particular temperament requirements for your dog's breed.
There are a variety of tests to indicate a dog's temperament. Many of the working breeds have a temperament test (for example, the Doberman's WAC test) for their breed. AKC has a Canine Good Citizen test (open to all dogs) that gives some indication of the dog's temperament (and, yes, training). Therapy Dogs International and other Therapy Dog clubs have temperament testing that does try to separate out actual temperament from training. Obedience titles can be (but are not necessarily) an indication of good temperament.
You must carefully consider each dog's pedigree for compatibility. Try to select strengths to offset weaknesses. Do not allow your bitch to be bred to an unsuitable dog, and conversely, be picky about the bitches you allow your dog to breed. This phase alone requires considerable research to find a suitable candidate, and you should definitely work closely with a knowledgeable person, ideally the breeder of your dog. Simply because two dogs "look good" or even *are* good does not mean that they necessarily complement each other: suppose they are both carriers for the same disease? Suppose they both have a tendency to overbites or other disqualifying faults?
Be honest with yourself. If your dog is not a good representation of its breed, do not let it reproduce. It is much easier to improve a few faults than to try and get excellent pups with a mediocre dog. Check the breed standard for your dog and ask a knowledgeable person for their evaluation of your dog.
We'll return the the importance of scrutinizing a pedigree in the genetics section below.
Ideally, a bitch should only be bred every other year and she should not be bred much before two years of age. The season closest to the second birthday is a good one to start with; certainly no earlier than this. In some breeds, you may need to wait one more season before beginning. By this time, she is better prepared mentally for having puppies than she would have been with her first few seasons. Her physical growth is complete and pregnancy at this point won't endanger her health, provided that she is healthy to begin with.
In breeds with Hip Dysplasia, many people wait until after two years of age so that the parents can be certified; however if you have sent in xrays to OFA for preliminary evaluation and they came back as fine, many breeders consider it safe enough to then breed on the season closest to the second year, which can wind up being before the bitch is actually old enough to be certified. (And when the bitch is old enough, she is, of course, duly certified.) But the preliminary xrays must be examined by OFA, not by a local veterinarian. There are many dysplastic dogs out there that had vets look at their xrays and pronounce them "wonderful."
It's important, however, to keep the frequency of breeding low. Even at maximum, you want to allow at least one unbred season between breedings. This allows your bitch to rest and regain her strength. A bitch that whelps too often will produce weaker puppies more likely to die, and the repeated pregnancies are pretty rough on her, too.
For dogs, they should definitely have all their certifications necessary. For many breeds this means that they should be over two years old. Since a dog can be bred at any time, unlike bitches, waiting for two years is not a problem, whereas a bitch often has a season just before two years of age and then has to wait until 2.5 or three which sometimes presents problems in trying to time her litters. But this does not apply to a stud dog, so he should definitely have all of his checks and certifications before being bred. Frequency is not generally a problem although some dogs have problems with sperm production if they breed once a day for several days. They need top-quality feeding and care if they are going to be bred often.
You should make sure the bitch is up-to-date on all her vaccinations, medications, and shots before she is bred. She will require supplementary food during the last three weeks or so of pregnancy. In general, puppy food is formulated both for puppies and pregnant or nursing bitches.
She should be under the care of a vet for any related problems. Dogs can have miscarriages. Illnesses, diseases, or infestations that the bitch picks up during her pregnancy can affect the puppies. Difficulties during whelping are entirely possible, and the rule for some breeds. You must be prepared to get her to the vet quickly in an emergency.
There are instances of "mummy puppies" where you have a puppy whose development went awry, but it was not aborted. Instead, it dries and shrivels up, and when born, looks like a mummified puppy, blackened and ready to rot. Overbreeding and inadequate care are usually the causes. It is quite likely that the dam will come down with an infected uterus after such a puppy. "Water puppies" are another type of problem in which the dead puppy appears to have never properly developed a skeleton and appears to be full of gelatin. This seems to be linked to a viral exposure.
Other congenital (but not genetic) defects can include: no anus, cleft palates and hare lips. These conditions require corrective surgery or the puppy will die.
While the bitch is nursing the puppies, she will require about three times the amount of food she normally eats! It is also common for nursing mothers to go out of coat at this time.
