I think we can all agree on that. Sure, some dogs will let you play rough with them. Good for her if she has one of those. However, she should be careful because her kid really isn't all there when it comes to threat assessment and just common sense. My kid is a little older than hers and she knows there is a BIG difference between family dogs and dogs she doesn't know. Our dogs use to let her ride on their backs, and she's now upgraded to wrestling with them like I do. However, she knows that they're comfortable with us and they LET us play with them like that.Hell, I don't care if Trig is even 10 pounds....nobody should ever let their kids step on or ride the family dog. If she wanted a step stool for Trig, she needs to get him a step stool or lie down herself and let him step on her.
I'm not saying her kid doesn't know that, but I think her actions show she celebrates whatever the kid might do. It's her kid and her problem, but I think she's risking the kid not fully learning what most animals will and won't tolerate.