[Help] Is it normal for boxers to "stack" on each other?

My parents have two boxers and my grandparents have one boxer and whenever they bring her over they all stack, as in our male (the biggest) lays on the floor while our female sits on top of him and then their female sits on top of her. It's the cutest thing and I wish I had a picture (I have one of our female doing this to our pit bull who died of leukemia). I just want to know. Boxer owners, is stacking just one of many bizarre traits that these dogs have? via /r/dogs http://ift.tt/2rVUMLU