Dog Cryptorchidism: Health Monitoring and Neutering Decisions

Cryptorchid dogs retain one or both testes undescended, carrying significant long-term health risks that inform neutering decisions.

Key Facts

Cryptorchidism is the most common reproductive abnormality in male dogs, affecting 1-3% of the population.
Retained testes are at 10-13 times higher risk of testicular neoplasia than normally descended testes.
Sertoli cell tumour is the most common testicular tumour in cryptorchid dogs, sometimes causing feminisation syndrome.
Retained testes in the inguinal or abdominal position are both at increased cancer risk.
Surgical removal (orchidectomy) is recommended for all retained testes regardless of location.
Cryptorchidism has high heritability; affected dogs should not be used for breeding.

Welfare Considerations

Retained testes cause no immediate discomfort but carry a high long-term neoplasia risk. Testicular tumours, particularly Sertoli cell tumours, can cause significant hormonal disruption, immunosuppression, and bone marrow failure if diagnosed late. Neutering removes the cancer risk entirely and is the most welfare-positive management option. Owners who decline neutering must commit to regular testicular palpation and monitoring for hormonal signs.

What You Can Do

Have any male dog with an undescended testicle assessed by a veterinary surgeon.
Discuss surgical orchidectomy — including abdominal castration if required — with your vet.
Do not breed from cryptorchid dogs; the condition has high heritability.
If neutering is declined, commit to 6-monthly veterinary examination of the retained testis.