I have been fostering Oscar for one week - he is improving on some of his behaviors, but he has about 4-5 spells a day where he incessantly chases his tail. He has a pretty good size nub - about 4" or so, and very fluffy, and it's driving him nuts.
I took him to the vet yesterday for a check up, and lyme and heartworm test, which were ok. She wonders if he is having phantom pain from his tail being docked. Apparently if the tail is removed after they are a certain age, it's almost like an amputation. The vet thinks it is too early with me to put him on medication, but I'm also considering a consultation with my holistic vet, Dr. Loops.
I try to calm and massage him when he comes out of one of these episodes because I feel so badly for him. If anyone has seen this behavior or has any suggestions, please let me know.