Thanks guys. he was just fine this morning when i got up, then before I left he was acting like it was hard for him to breathe, and his head was twitching around. When I got him to the vet, they also noticed that his eyes weren't dialating properly. Basically they figured it was either a brain tumor or blood infection.
I called my wife and told her to come to the vets and we made the decision to not make him suffer through lots of treatments that probably wouldnt have helped. He went peacefully in our arms.
We picked out a nice spot in our back yard where the rabbits play a lot and buried him there.
I'm going to miss that little guy. He was my buddy.