How long until an undescended testicle in a dog becomes cancerous?

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An undescended testicle (cryptorchidism) in a dog tends to become cancerous in middle to old age, with a higher risk after 8 years. Therefore, if a dog has cryptorchidism, it is best to neuter it soon to prevent later cancer and protect lifespan. A cryptorchid dog cannot breed, so early neutering is advised to lower the chance of reproductive disease and cancer in old age.

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