How can I pin down/anchor a car seat cover for my dog?

Noel in NH
by Noel in NH
It has elasticized corners and also straps that fit under the ends of the back seat, but these started popping up after less than a week of use by my dog. I can't seem to pull up that seat on my Prius in order to keep the straps in place, and want to tack the cover down somehow. Any ideas?

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