Updated On March 9th, 2020
Pet's info: Dog | Cocker Spaniel | Male | 1 month and 17 days old
Answered By Dr. Elizabeth 118
Veterinarian
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That's hard to say without being able to examine and monitor the testicles. It's possible this is congenital. If Digby is not a breeding dog, an undeveloped testicle is not a big concern (though I do recommend to have him neutered). A less common cause of a size difference is a torsion or infection. A veterinarian can get an idea of what is happening with an exam. I hope this helps.
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