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How to greatly improve the life of a dog with arthritis
Place extra padding in your dog's bed.
Your dog may have a hard time being comfortable in their bed with joints that are stiff and painful because of arthritis. Putting some extra padding in the bed will make life a little better for your dog.
For extra padding, add some extra thick blankets on top of or below the bed. You could also purchase foam pads at your local pet store.