Too cute! But man! Don't you worry about his back legs and hips breaking down? That's a lot of weight at a weird angle and for such a long time. He looks happy though.
The dog looks happy and it's really cute, but my freestyle instructor (yes, we took freestyle classes; my dog has focus issues and I thought they would be good practice) said that she thinks the dog could get back/hip problems from that.
Not sure it's true, just something I thought I'd mention.