Hello all YTs, this weekend I introduced Linus to my sister's dog. They are both 9 months. After 2 straight days together, I still can't figure out if they like each other or hate each other! They rumble for hours, growling, nipping, and rolling around. Then they'll follow each other around and explore together. So confused about whether they hate each other but get tired of fighting, or like each other and are playing. Any thoughts?