After hearing everyone's horror stories, I can't feel as bad... Yes, it's just hair and it'll grow back...but I'm a very impatient mama.
"Winter"? What's that? It's 69 degrees out right now! But he does have really thin hair and bald spots, so I think it would actually be bad to trim him. He'd constantly need his sweaters on, even inside. And because he's so *ahem* well endowed, I have to take his sweaters off before he goes outside to pee. He'd probably refuse to go outside at all if he only had 1 inch hair.
Thanks again everyone! You've made me feel a lot better. Zeus doesn't seem to mind so I should take a lesson from him.