So even though Rosko probably wouldn't admit it just yet. I think he likes Athena. At first he was a big bully. Always taking her toys, getting in between Athena and whoever was petting her, and playing way to rough. Now he doesn't take every toy, doesn't care if she gets pets, and will lay down and play on her level. I still have to make them both calm down occasionally. She is a little firecracker and will instigate rough play but then Rosko will get carried away. And she doesn't back down so I have to be the voice of reason. It did take quite a bit of one on one with Rosko to make him realize he wasn't being replaced. Or maybe that is just how long it takes dogs to acclimate to another dog.