Thanks for everyone's concern. My vet said overgrooming is usually triggered by stress. I'm not sure what would have caused this, he is an indoor cat with one much smaller female cat for a companion-they get along well, and there hasn't been much of a break in his routine. He is taking a three week prescription of progesterone to calm him down (he isn't hyper, just a little too nervous sometimes.) I haven't noticed much of a change in his behavior, but he has stopped picking at the hair on his tail and back, so hopefully all is well. I can't wait for it to grow back, he looks a little silly at the moment.

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