I once found it useful to land on a raging dog. Basically pinned him on his side. Nothing made that formerly wild dobie's feet start a scootin' than 200lbs of geek on pooch love.
Yes, I wear that badge of stupidity proudly.
I remember inverted them can make a mad dog quite docile. Not that I'd want to try that with a truly aggressive dog's jaws snapping anywhere nearby. If they were bred for fighting and they have an attitude, I'm more likely to practice my "where's superman?" line. Especially at this point in life. My 40lb border can kill me with activity, entirely escaping that tricky problem of euthanasia.
As shakran said, carry some type of mechanical advantage. The doctor bills from a digested skull are pretty bad.