Quote: Gosh, the mounds of feathers is very characteristic of what hawks do. The Cooper's here will hold the bird down and pluck feathers before feeding. I can always tell a Cooper's kill of a dove by the mounds of feathers. I suppose the dog could hold the bird down and do the same though. Generally, from what I've read and seen in the Predators and Pests section, dogs attacks tend to distribute the feathers everywhere. The damage to the back looks very much like what a person here in Tucson described to me when a Cooper's got into her Seabrights. Still though, your previous experience of seeing the pooch with blood on her muzzle would make her the prime suspect. Although, without seeing it in action, it's hard to know for sure.