I would definitely take him in and have them surgically removed. They can breed and go thru all the motions, but will never be able to reproduce bacause they are infertile. They can also be just as dangerous as any breeding jack when the jennys are in season, and some jacks get very aggressive towards humans at breeding season. How old is this jack? Can you feel them
if they are way up in his thighs..if you can he might still drop if hes a fairly young jack. Would you be able to have your vet check him for you, if he is a true crypto it can be costly for the surgery. Corinne
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