To Krystal Sewell and Weehawk: Judging from Weehawk's actions, it does seem that he is a bit more "macho" than one would expect from a MF ferret. I do agree that there is a possibility of a retained testicle or part of one. Concerning what you should do now - there are no good tests available as of yet to screen for the presence of a retained testicle. Ultrasound is probably not an answer, as you may be looking for an atrophic testicle, which would be very difficult to pinpoint. Best suggestion - have your vet do a good physical exam, preferably under some inhalant anesthesia. On one of my 4-year-old adoptees, we found the testicle in the inguinal canal only after he was sedated - the rest of the time it was probably hiding too far up to feel it. If you don't feel it there it may still be in the abdomen - and that would be the next place to look (surgically). Other things that you would see in a ferrret with a retained testicle is the typical waxy coat that intact males have - and he should be muskier than other neutered males (which you would also expect in an incompletely altered or intact male. Finally, I urge you to make sure we get this testicle out - retained testicles have a nasty habit of developing tumors. They won't produce sperm, because the temperature of the body is too high, but they will develop neoplasmen. I removed Bob's testis, it had 4 different neoplasms in it (luckily none had gone malignant). Bruce Williams, DVM, DACVP Department of Veterinary Pathology [log in to unmask] Armed Forces Institute of Pathology [log in to unmask] Washington, D.C. 20306-6000 (202) 782-2600/2602 [Posted in FML issue 1182]