Hi I have never had this personallybut know some breeders who have. They were always advised to get the dogs castrated as can cause problems in later years.
Also when they are pups and undescended testicle they have got crystalsfrom Ireland and the testicle has descended

 

they are prone to go cancerous, i personally would have them removed.

 

My cat had a retracted testicle, it was not as difficult to neuter him as i thought, it was in his groin. Shadow just had an extra shaved bit on the inside of his top leg, and the obvious bit removed from where they usually are.

 

ive not had the trouble but know people that have and have had them done.
if ever i did have a dog with one then i would have the op best to have it done on the safe side than not at all.

 

ow yes my friends dog had this problem he had to get them removed,if it was my dog i would take him the vets better be safe than sorry

 

I've always been told they are best removed.

Heres a link to have a read cryptorchidism

 

Thanks for the responses, I think I will elect to have the surgery done to avoid any later problems.