Thats so sweet of Robin Hood.
You know I've read about cases where rats get myco but they have good enough immune systems that keep it away from vital places (like the lungs and throat). So Casper might have a cold for a long time. The only thing I'm worried about is that if he gets older and his immunes go down, the long waiting myco will take over. So I'd get him meds anyway. Before its too late. Thats my new motto with rat sicknesses.
Before it's too late.
Sad but true. But don't worry; just get him that stuff Heather got Peanuts and I bet he'll be bouncin all over.
Lila