Symptoms of Infertility in Male Dogs
The main symptom of infertility is not really a “symptom,” but instead is an outcome: the failure to produce puppies. Many of the causes of male infertility are painful, which contributes to their reluctance to mate. Other causes result in low or absent sperm production, which should not cause physical signs in affected males.
- Loss of libido (sex drive)
- Bloody urine (hematuria)
- Difficulty urinating (dysuria)
- Straining to defecate (tenesmus)
- Enlarged, inflamed, painful testicles (orchitis; one or both can be affected)
- Reluctance to sit
- Stiff, stilted gait
- Abdominal pain
- Increased frequency and volume of urination (polyuria)
- Increased thirst and water intake (polydipsia)
- Appetite changes
- Weight changes
- Small testicles (one or both)
- Enlarged testicles (one or both)
The genitalia of dogs with intersex chromosomal abnormalities often look abnormal to the naked eye.
Dogs at Increased Risk
Old dogs have an increased chance of being infertile, as do dogs with certain hormonal and metabolic diseases. Dogs that are scolded or punished for exhibiting sexual behavior when they are not in a planned breeding situation are at an increased risk of being shy or reluctant breeders. Cryptorchid dogs with one or both undescended testicles are predisposed to being infertile, as are stud dogs that are overused. There is no reported breed predisposition to infertility in domestic male dogs.