Had a rescue dog that looked black lab/Rottweiler mix. Got it as a pup and it got along with my other dog and cat, never a problem. We had a baby about the same time and it grew up with our little boy. About 4 years into it, I noticed that if my little boy went near the dog while it was eating it would growl at him. I corrected him a couple times and thought that was the end of it. Once day my son wandered by and he nipped at him. I took the dog for a walk in the woods and that is where he is til this day.