My Dad worries about me breaking a bone in one of my legs because I run like a nut sometimes through thick brush. Especially when I'm playing chase with Happy or some other dogs. One time I did twist my foot in a hole when I was chasing a rabbit. It got away and I got a sore foot. I'll get it next time!

Anyway here are some sites that have good advice on what to do it you think your doggie has broken a bone. First thing you should do is to keep your doggie quiet and still, then get him/her to the vet right away.