I am just wondering how old your puppy is, if you have just purchased him I am thinking he may only be around the 12 weeks age. You still have another 12 weeks if this is the case for him to wait for his surgery. In that time maybe his testicles could still come down. It is not uncommon for them to come down later in some puppies and that may be the case with your puppy if he is still that young.
It is a common condition in toy breeds and can be hereditory so the breeder must have known of the possibility and should have told you of it. From what I have read though, normally you should wait till the puppy is at least 9 months old before neutering to make sure the testicles are not going to descend on their own, then if they haven't you should have them surgically removed.
It is a common condition in toy breeds and can be hereditory so the breeder must have known of the possibility and should have told you of it. From what I have read though, normally you should wait till the puppy is at least 9 months old before neutering to make sure the testicles are not going to descend on their own, then if they haven't you should have them surgically removed.