Thanks! Someone on Rav said the same thing, Julie.
I cut the zipper part off a snack size bag, put some rice in it and then folded it over and stapled it then folded it again to fit the bunny and taped it. It helps him stand up.
Also... Instead of picking up stitches with the yarn attached I bound off. Then I picked up all the way around and went 'backwards' so the ridge would be on the outside..makes it stand flatter.