Here's what I know: 2 bites to one foster mom. The first was over chicken, trying to take it away from him. The second was over going into the crate. I have not seen any aggression over the crate unless you're forcing him in, he goes in great with a little treat, and now we don't even have to do that. He sleeps in the crate and goes in there when he's not supervised or we're not home. I think she needed stitches for both, but she's older and disabled.