I have a jack russel who is great with our birds, she would not hurt any of them. She killed two guineas when we first got her but we have trained her not to do that and she has been very good about it. She would not even hurt the babies, we had a few duckling pop the glass panels out of the incubator and come looking for me early in the morning and she just lay there and made sure they did not attack us upstairs (she guards us from everything). She does a cats job to a kills the rodents so she is a very good dog all around. She cannot kill raccoons though. I was wondering what you though the best guardian dog breed is.