OK if you have an older dog or one with arthritis you need to check out Buddy Beds.

I have been searching for tempurpedic type (memory foam) material for dog beds for awhile. While searching online today I found this site. What a great idea if your dog will actually use a bed…LOL.

They are a little pricey, most likely due to the cost of memory foam, but this can definitely help out a sore dog. Your only other choice is to cut out a mattress or mattress covering made out of memory foam. However, these look like high quality products as opposed to butchering a mattress cover.