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ac186bab57 ^ The Negative Aspects of Neutering ^ Golden retriever study suggests neutering affects dog health ^ Sanborn, Laura J. Retrieved 2013-12-09. This stage is also known as "heat." The length of these cycles varies greatly between individuals. During proestrus and estrus, females may have a clear to bloody discharge. Canine reproductive behavior Canine transmissible venereal tumor Semen collection#Dogs Gray wolf#Reproduction Dingo#Reproduction Animal husbandry Puppy mill .
The genetics of the dog. Siegal, Mordecai (1995). The two stand with their hind ends touching and the penis locked inside the vagina while ejaculation occurs, decreasing leakage of semen from the vagina. After some time, typically between 5 and 20 minutes (but sometimes longer), the bulbus glandis disengorges, allowing the mates to separate. ISBN978-1-4464-8976-5. ^ , Dr B Eilts, Louisiana State University Veterinary Medicine, "Canine Pregnancy" retrieved 10 April 2013. ^ "Top 10 reasons to spay or neuter your pet". At the time of penetration, the canine penis is not erect, and only able to penetrate the female because it includes a narrow bone called the "baculum", a feature of most placental mammals. When the male achieves penetration, he will usually hold the female tighter and thrust deeply. It is during this time that the male's penis expands and it is important that the bulbus gland is sufficiently far inside for the female to be able to trap it. Part 1: Significance, clinical aspects and etiopathogenesis]".