Testis of male dog is the core organ of male reproductive system. The development of male dog testis is accompanied by its own descending process. If it fails to descend from the posterior peritoneum to the scrotum in accordance with the normal development process, cryptorchidism will appear. Cryptorchidism is a common congenital malformation, the incidence of which gradually decreases during growth and development, if in the human body, the chance of the baby continuing to decline after 6 months of birth is significantly reduced. In the process of testicular descent, any link may lead to the occurrence of cryptorchidism, the exact mechanism is not clear, so it is crucial to diagnose this disease through veterinary B-ultrasound in time and eliminate such sick dogs in time. It is generally believed that testicular insufficiency may be related to the influence of endocrine hormones, testicular development defects, genital nerve and its neurotransmitters, genes and products related to cryptorchidism and other factors, so it is very important to check the normal testis with B-ultrasound.

The disease of cryptorchidism mainly causes the increase of testicular germ cell apoptosis and the production of anti-sperm antibodies through various ways, leading to the reduction of spermatogenic ability and affecting fertility. In animal clinical practice, the testis that do not descend to the scrotum in male dogs without cryptorchidism after 5 to 6 years of age are very likely to cause malignant changes. Since the anatomical structure and hormone secretion of dogs are more similar to that of humans, this study took a unilateral cryptorchid dog as the research object, and applied veterinary B-ultrasound to explore cryptorchids. By comparing the differences in the size, weight and histological changes of Gu pills in cryptorchid testis and contralateral scrotum, the clinical diagnostic value of veterinary B-ultrasound and the influence of cryptorchids on testicular histology were discussed. It provides some medical theoretical support for further study of the effect of cryptorchidism on animal reproductive function.

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