I tend to touch Kaji all over, mostly to see if Kaji's knees are hurting him. I also love massaging his back.

I was touching his nubby tail and I felt a bump on the tip of his tail. Should I be concerned? I was thinking of scheduling a vet appointment to have it checked out. I've been monitoring it for a few days. It hasn't grown, and it moves under the skin. It doesn't hurt him at all. Can it be a result of his tail being cropped?