Wooter, our cat who is turning 6 years old this August, went through a rough time with her tail. Shown here is the end result of one of her mutilation sessions. She would take her tail in her mouth, chomp down on it, then drag it through her teeth. The tail would split open and bleed all over the place. It usually ended up on the washer and dryer which made for easy clean up but a shock to see in the morning! So we had this happen three times. When Wooter would do a bad mutilation like this we would take her in to the vet and they would shave the tail and get it all cleaned out but luckily we were able to avoid antibiotics. Eventually since we couldn't pinpoint what was causing her to do this we opted to have her tail docked. Now we're not sure if that was the answer. It might be problems with her anal glands causing her the upset in her tail (or what's left of it) and her hindquarters. Until she can speak English to us, we won't really know though so we just pray that we are doing right for her and press on.