Cryptorchism can happen to most any animal and humans. The testicles can even be located well into the belly. I am not sure about a small animal like a cat - but a sexually mature human or large animal - can be checked by a blood test for the male hormones. I have never heard of an animal not having testicles at all though it is no doubt possible. They are in there somewhere! Since cats are considered sexually mature at 6 months - I am suspecting that a blood test will confirm that Starr is a cryptorchid and that his surgery will be similar in price and recovery time to a hysterectomy.