The worst dog bite I ever got was from a Peke. Chewed up my fingers - felt like I was stuck in a garbage disposal. I had trouble using those fingers for months after.
While working at a dog grooming shop, I was getting a golden retriever out if a cage, and it flipped out. I ended up with 10 stitches in my left forearm and a groomer got her hand broken in 5 places. The family said they never had any problems with the dog and after it got hauled off to be "observed" they threatened to sue me if it got put down.