Krystal and Weehawk, There are a few common conditions that could cause a 1 yr. old male neutered ferret to return to male behavior (try to mate with female, marking/dribbling of urine, having erections). 1)Adrenal tumor---this is by far the most common possibility. There is a new blood test to diagnose this--but it is usually not necessary and costs as much as the surgery to remove the adrenal tumor. I would strongly recommend an exploratory to remove the adrenal tumor. (May want to consider a CBC and SMAC prior to surgery) 2)Retained testicle---there could be a testicle in the abdomen (the testicles start out in the abdomen and shortly after birth travel out of the abdomen to the scrotum) If one or both testicles remained in the abdomen we could see these symptoms. The cure for this is surgery to remove the retained testicles. 3)bladder stones--- much less likely then the other choices with these symptoms. The treatment is surgical remove of the stones. I strongly recommend surgery by an experenced ferret surgeon and a CBC and SMAC pre op. I do not feel its worth the money or time wasted to do ultrasound or more involved bloodwork. Good Luck Dr Weiss 301-299-4142 [log in to unmask] [Posted in FML issue 1180]