Millie does the frog thing like in BABYMAJOR's picture also, but not during obedience. Like if I ask her to sit, she sits properly. In the car or where she is sitting for a long period of time, she will push her legs to the side like that. I think it is more comfortable for them, especially b/c their butts don't touch the ground when sitting (at least Millie's doesn't) but if she moves from the squat position to swinging her legs to the side, then she can rest on her but rather than the backs of her legs. I bet it's similar to humans trying to sit in a low squat for a long time.