Tico, We do repeats. No need to be concerned about whether we've had a red-tailed hawk or not. You're fortunate to have this bird in view. There's a red-tailed hawk living on Fifth Avenue in NYC. He's kinda famous. In fact, there were a couple of threads here about him and his mate. If I can find the links, I'll post them.
gus, I agree with Region. Likely to be a physical malformation. Unfortunately German shephers are bred to have a sloping back. This causes all kinds of problems.
Reg, I gotta admit to a certain feline family resemblance. However, leopards have much bigger teeth than we swifty types.