Great thought, Shelia, you're absolutely right.
Whether you see it as a good thing or bad, out here the cats are probably more vulnerable than the birds. We do get the occasional feral cat around (and I've brought in 2 drop off kittens,) but they don't last very long between my dogs, the coyotes and other predators.
Are there other animals that would prey on birds? I don't think my dogs would bother them other than making a mess of the water.