I started to think about how Wille interacts with other dogs after I read this article in Bark magazine (click), and came to the conclusion that he mostly plays with bitches and rarely gets into fights. He has two, one labradoodle and one pug/chihuahua, that he really likes and can play with for hours. They are both forward going and have strong opinions. Wille is a sweet dog and likes rules so it makes sense that he is drawn to a little more straight forward kind of dog personality. It is the bitches that set the rules and he just tags along.
But when they get tired the tone of the play usually becomes sharper and I have, on some occasions, had to step in and tell them to stop. I am never afraid that the play is going to get too rough or serious with them, they usually keep it on a good level, but I always keep an eye on them to catch, before hand, if they get tired.
Our research shows that for many dogs, play fighting is the primary method used to negotiate new relationships and develop lasting friendships.- Bark magazine