I have heard of dogs that were such vigorous "waggers" they would injure their own tails, causing such chronic wound and infection problems they wind up getting their tails amputated!!!
I'm sure what happened wasn't intentional. I board my cats @ the vets when we are out of town. I usually ask them to make sure their shots are up-to-date, and if they need a physical, cool, do it then.
They are there right now because we were in Hawaii till Fri late. So, I'll pick them up tomorrow. One of them has been getting sick. Never caught s/he in the act, just saw the evidence. Since they're in separate cages @ the vets, the culprit has been identified, and the vet was getting some tests. I'll find out tomorrow what the problem is. Hopefully, it'll just be a diet issue, and I can just feed Jenna separately. (Jenna once ate a strofoam peanut. Bad. Bad!)