Bone ball dog treat toy
You can take several little dog treats and paste them together with peanut butter and stick them inside of an old tennis ball by cutting a little slit in it. Your dog will be happy all day trying to find the treat inside.
Editor's note: This definitely sounds like something we will try with Comet. He tends to get bored while we are working on our computers and he loves peanut butter. Thank you for submitting this dog treat toy idea.