Do you have a dog or cat bed that's flattened out. Here's what I did to put a little life back in it. I bought some polyfill from the store and restuffed the bed. Most of the newer beds have zippers so you can do this. The polyfill costs about 5-8 bucks for a box and my dog was very happy when her bed was restuffed and more comfortable for her to sleep on. And it's a cheap way to do it instead of the expense of buying a new bed. Better yet, hit the garage sales and find some pillows on sale and do it that way!
I use two other items:
A bag of shredded foam, this is available at fabrics stores and upholstery suppliers.
The foam has more resilience allowing the pets burrow in a bit.
A bag of cedar shavings available at pet stores.
Cedar is a natural flea repellant and has a clean fragrance.
You can premix them in a large trash bag, or pour into the inside liner and mix by shaking.
NOTE: This can be messy, best done outside.