The dog or bitch is unable to mate. It is more common is bitches than male dogs.
For Bitch: The symptoms for infertility in a bitch are inability to copulate, no pregnancy post copulation, frequent cycles or no cycles. Causes could be hyperplasia, cysts, hormonal disturbance, infections, abnormal ovarian function or even genetic.
For Male Dogs: In males the symptoms would also be inability to mate or no fertilization after mating. Causes could be small litter size, ageing, injury, drugs, degeneration of testes, hormonal disturbance, infection or genetic.

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