What is going on??

[jennielynn1970]

Sounds like stress related biting. My Honeybun would do that to his paw and pull out chunks of fur. Since my one foster has gotten adopted, he's been much better and no more biting and pulling out fur, but had he not, I would have gotten him on an anti anxiety medication. Maybe the stuff Medusa (Mary) uses, Clomicalm, would work for him?

[Freedom]

Have you used a water spray bottle to interrupt their battles at all? Maybe if the one stops the fighting, the other will stop attacking his own tail. Just thought.

[catfamily]

those plug-ins for cat stress related behavior work great here.
they sell them everywhere but can be pricey.
feliway comfort zone
www.upco.com sells them.... and other places.