I took care of my sister's dog yesterday. I was surprised at how excited Misha and Summit were to see each other. You'd think they were two little kids. They don't really play together. Summit is much older (11 years old). But, they like to hang out together. They'll sit at the front door like two buddies. I don't have to worry about them because they usually get along just fine despite the size difference. Summit outweighs Misha by 60 lbs. Misha does have problems with strange dogs, but for the most part she gets along fine with all the family dogs. Only Yogi, who is younger than her, gives her a bad time. That's because he is a pest. I know it can be good for their development to be around other dogs. Despite Misha's feisty behavior at times, she is completely submissive to all the older dogs in the family. She's funny. She will throw herself on her side and lift her leg so they can smell her. Maybe she recognizes how much larger than are than her. Do you think it's important for dogs to have dog friends?