Just because people have issues with hormone levels doesn't mean a dog or a horse will, there are to many differences in the make up of each. You have yet to tell me what issues a horse will have, you just keep saying it has to have issues because people do. Well horses don't eat the same as people, they don't sleep the same as people, they don't mature the same as people so how can they have the same issues as people. I too will not be changing my mind, I have a great vet who thinks gelding early is just fine, I have had several gelded before they reached a year old with no issues at all. I have had several dogs spayed and neutered and they lived to be happy, healthy pets up into their teens. I much prefer they live longer while not producing more unwanted dogs for society to have to deal with. Same thing with horses, if more people would geld earlier, you wouldn't have those accidental breedings with yearling colts. So, until someone can give me concret issues that gelding a colt under 6 months is harmful, guess I will keep doing it when necessary. Its worked for me so far.