I'd like to make a longer one to accommodate Puppy, as he fits nicely in the largest width-wise but is too long - the beauty of the pattern is that it's easily altered to accommodate a range of animals of different sizes and shapes.
I bought the pink fabric from Stitchbird because I really felt that they had to be set. Not because I like buying fabric, oh no. All the rest of the fabrics came from my stash so I feel vaguely virtuous about the whole exercise. Vaguely. Though if I have to get a fourth version to make Puppy's bag...

Just simple straight line quilting but you could get fancy if you wanted - they'd be a great project to try out free-motion machine quilting.
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Note: Just to clarify, the pattern for the sleeping bags isn't mine - if you'd like to make one the pattern is available from Flossie Teacakes at the link above. Thanks!