An abnormally small preputial orifice, resulting in inability to extrude the penis, can be congenital, or acquired as a result of neoplasia, edema, or fibrosis after trauma, inflammation, or infection. Clinical signs are variable. Usually, the problem is unnoticed until the dog attempts to mate and is unable to copulate. Urine can pool in the prepuce and cause posthitis. Diagnosis is established by physical examination of the prepuce and penis. Treatment depends on severity of the stenosis and intended use of the dog. If the dog is not used for breeding, therapy probably is not needed, although castration should be considered to prevent arousal. Surgical enlargement of the preputial orifice is indicated if the animal is to be used for breeding, if the phimosis contributes to balanoposthitis, or in the unlikely event that phimosis interferes with normal micturition.
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Also see pet health content on reproductive disorders of male dogs Reproductive Disorders of Male Dogs Several reproductive diseases can affect male dogs. This section discusses the most common of these disorders. Cryptorchidism is a failure of one or both testicles to descend into the scrotum... read more and male cats Reproductive Disorders of Male Cats Several reproductive diseases can affect male cats. Although most of these disorders (other than cryptorchidism) are rare, the most commonly encountered conditions are discussed below. Cryptorchidism... read more .