Have you gotten rat food for your rat yet? Also, if he's living alone that may be the source of his aggressive tendencies. Rats are very social and always do better in same-sex pairs. If he's by himself please get him a male friend so that he's not alone.

Neutering is, IMO, totally and completely worth every penny. Even if it doesn't alter his temperament it will extend his lifespan. My neutered boy did calm down quite a bit after the surgery, at least in my eyes. I didn't have anyone around to confirm it at the time, but he seemed much more mellow overall.



Here's a link to a recipe for a homemade rat diet if you still need it:

http://www.ratfanclub.org/diet.html

Or you can go to www.goosemoose.com/rfc and ask Suebee for her recipe, it's supposed to be easier to make.