After selecting the parents and estimating the time of ovulation, the owner presents the bitch to the dog to be served. For health reasons, it is best to check ahead of time to make sure that neither dog has any genital lesions. This reduces the risk of transmission of venereal diseases (namely canine herpesvirus). Preventive prophylaxis (regular washing of the sheath, clean floors) and regular serological tests are preferable to last-minute use of antiseptics, which are often spermicidal and so prevent fertilization.In longhaired breeds, smoothing, pulling back, or shaving the hair in the bitch's perivulvular area will facilitate the mating.Mating begins with a brief courting and sniffing phase that excites both dogs. Erection, caused by the rigidity of the os penis and the flow of blood into erectile tissues, then allows intromission of the penis, which causes vaginal contractions in the bitch. These contractions help the sperm to ascend the reproductive tract, help maintain erection, and cause the tie during ejaculation. This phase should last at least five minutes, but may last more than a half-hour if the bitch's movements maintain the constriction around the erectile bulbs.
In most cases, if the timing is right, the dogs will get along very well by themselves and need not be disturbed. Discreet observation from a distance (or by video camera) is all that is required to verify mutual acceptance and that the tie has indeed occurred. Note that even if the tie does not occur, mating may be successful, although litter size is often reduced.
In spite of advancements made in determining the time of ovulation, it is still wise to systematically provide for a second mating forty-eight hours after the first.
Some owners sign a mating contract, then take their bitch to the stud dog's home and leave her for a few days. The contract can be based on the international rules adopted by the FCI (Fédération Cynologique Internationale) in June 1979, to replace the Monaco custom. A lease agreement governs the conditions by which a breeder releases a bitch to a third party on the condition that the breeder will own the weaned puppies.
If natural mating between the selected dogs turns out to be impossible (for any one of a variety of reasons), the breeder must resort to artificial insemination.
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