LuAnn-
I looked it up on Wiki and this is what it said:
The Red-tailed Hawk is carnivorous, and an opportunistic feeder. Its diet is mainly small mammals, but it also includes birds and reptiles. Prey varies with regional and seasonal availability, but usually centers on rodents, comprising up to 85% of a hawk's diet.[14] Additional prey (listed by descending likelihood of predation) include lagomorphs, shrews, bats, snakes, waterfowl, fish, crustaceans and insects.
So the answer is yes, but it's low on the list so I'm not sure if he's interested in partaking of my finned pets. He seemed to be eating something when I first saw him, so I might have to go and clean up the nasty remnants (and maybe put something that will keep birds from landing atop my chimney like that!)
I did have Rocky in the back yard when I moved in on his play perch (when he was fully sighted) and there was a hawk circling overhead. Notice Rocky's head cocked to the side so he could focus on the predator above him (way above him, not closing in).