My Chinchilla was in great shape when I left on Friday. He was active and eating. When I got home on Sunday he was immobile and breathing heavy. He died this afternoon. He died prematurely. Sucks.
After a bit of reading and info, it looks like he died from over grown teeth. He was eating just fine, but his front side was soaked. It looks like he wasn't able to drink properly. I ordered a new water bottle thinking that was the problem, but obviously it wasn't. I checked his teeth, and it looks like he stopped taking care of it himself. I should have caught it, but didn't notice any abnormal look or behavior, except the wet front side.