Orchitis
Inflammation of the testicles or orchitis can cause infertility if not treated promptly. It can be caused by disease or injury to the testicles. The symptoms are usually inflamed, excessively firm, enlarged testicles that are painful for the dog. The first sign an owner has that something is amiss may be the dog walking strangely or spraddle legged and a desire to lay on cold surfaces like tile or in tubs. Dogs having these symptoms should be seen immediately for treatment by a veterinarian. Those that are not for breeding purposes should be neutered; those that are to be bred could become infertile if proper treatment isn’t received.