Hello, I am new here and was hoping to get some insight on what could possibly be going on with my new dog. My husband and I adopted her one month ago tomorrow, she is a black lab/german shepard mix and a total sweetheart. She is very loving and gentle. We also have a black lab/pit mix that we've had for 8 years, he is also a complete sweetheart, they always get along and love to wrestle and play outside together. But what I have noticed since we've adopted her is when she is laying down all he has to do is walk by her and she will snarl her lip and growl, which I immediately correct before she has a chance to bite, and she listens and stops everytime. I am just so confused! She is perfectly fine with him any other time INCLUDING around food, but when she is laying down she gets very defensive if he is near, he does not harass her or bully her, he is very sweet to her. We were wondering if something happened to her by another dog while she was laying down and has caused her to act this way, she did have a scar across her snout when we got her from the shelter, it looked like she was possibly attacked by another dog. Anyway, sorry for the long post we are just trying to get some helpful advice! We are open to any advice anyone has to offer us and we would be extremely greatful! thanks!