I don't know why they would find it strange at all.  Have I become so emersed in the dog world, I don't see the other side anymore?  I don't know, but I don't remember ever finding dog play groups strange.  Maybe I didn't know about them before I had small dogs myself.  I did used to think it odd for people to dress their dogs and buy them expensive things.  But I got over that when I joined YT!  
