Dogs have many different play styles. One of the key elements of effective dog socialization is matching dogs that have similar views on what is “fun” when they hang together. For some dogs — and not necessarily just the older ones — a good time is lying in the shade on a sunny day sipping lemonade. Then there are dogs like Ryder and Decoda that play as if they are mortal enemies. 10 years ago I would have freaked had two dogs started up like this in my presence. This time I just took a moment to make sure they were really playing then went back to what I was doing. You get used to wild play.