I bought a yorkie poo from a pet store (bad, I know) he's a great wonderful dog and I love him he's 4 months. I bought an 8 week old jack russell/yorkie mix from a possible BYB 2 days ago because I wanted Bentley *the poo* to have a playmate. Now my question is this, I'm not VERY experienced with owning multiple dogs and I can't tell if they're playing or fighting. The yorkie russell mix is REALLY small and Bentley isn't really that big, but I'm just concerned. Thanks for the help!