Within a couple of weeks she was happily riding on her own, so free in fact that she had an accident and got a big bump on her head. (religion-online.org)
Most bumps on the head are minor and heal just like bumps anywhere else on the body. (headcasecompany.com)
Just the other day I was reaching down to give an affectionate scratch to my older dog when I felt a new bump on her head. (caninejournal.com)