My Min-Pin Sarge was neutered about 12 weeks ago. Everything healed beautifully, and he showed no signs of discomfort. When our female dogs came into heat, we didn't think any of it, because all of our male dogs are now either fixed or incapable of producing offspring. Well, we have caught Sarge in the act with my mom's LHC a few times now. I didn't think they were supposed to get those hormone surges after they were neutered? He has also been more aggressive than normal when he plays with his toys, and he won't eat anything. I just didn't think they were capable after they were fixed.