If you have unwashed fabric, I would work on that. If you have any patterns and magazines that you haven't gone through, you could bring those down and make some plans. Is your computer downstairs? You could use this as an excuse to browse fabric websites on line, LOL. Or learn some new techniques on youtube. If you have finished, unquilted tops, you could trim frayed threads on the backs (ugh, my least favorite task). And definitely work on your hand sewing.
Wishing your dog a speedy recovery!