I think Maggie misunderstood the directions. She took convertible to mean from human to canine. Or perhaps Britax is secretly paying her to do product testing...?
And just so you don't think I'm a negligent dog mom - my dogs normally travel in crates. I forgot to latch the door this time, and Maggie made her move. First she cleaned the food crumbs out of the child seat (we also call her the corg-ba), then she decided the view was nice, too.