my 2yr old boxer seriously maimed a canadian goose,i think he thought it was a toy,he has a stuffed animal that is almost identical,aside from that he hasnt hurt a fly in the 2 yrs ive owned him,growing up i had a mixed breed terrier type dog that killed every animal native to my state,his favorite were garter snakes,just thinking back i must have seen him kill over the years rabbits,birds,squirrels,racoons,moles,if it moved and was in our horse pasture ,it was dead more or less,im glad my boxer doesnt have much of a prey drive,but then again hes not a ranch dog and his main job is chasing his toys from room to room.