We have a husky (we think she is a mix) she attacked our chickens. We ALSO have a border collie and a mix terrier who are so gentle to chickens. So I agree with you there. Although none of our chickens were killed, but that was because we noticed fast enough, or they would have been.I had a Husky that killed anything and everything when he got loose so I rehomed him.The funny thing is he never killed mine.
I had some chickens free ranging once, and a neighbors dog got out and attacked an Australorp named Jasmine. She luckily made it through, despite nerve damage and almost being put down by the vet. I am now very careful with dogs and chickens.