Atticus' testicles have still not descended at four months of age. The vet told us that if we want to have him neutered with undescended testicles it will run us $350 instead of $180. So, I have two questions, one that is mostly wishful thinking... i.e., if they're not descended, are they "inactive?" Two, if the answer to number one is "no," exactly what differences are exhibited between neutered and non-neutered dogs? I've only had female dogs up to now, so really don't know what to expect. The likelihood of him impregnating another dog is virtually nil, btw. Then again, that is now and who the hell really knows what the future holds.