Just today I was playing with one of my ratties, Hero, and he climbed onto my arm and ran as fast as he could and jumped off my arm onto the floor. I spent a good ten minutes chasing him around my room, and when I caught him, he was quite afraid and for the first time he squeaked when I held him! I put him back in his cage and now whenever I put my hand near him he freezes up or runs away. I'm quite upset with this because I had made a lot of progress with him! Now, he won't even take the treats out of my hand when I offer him one! What should I do?