@jcboy,
You might even make the dogs some treats with the peanut butter. Next time you bake them some treats, add in peanut butter. You can also Google recipes for both baked and no bake dog treats, that use peanut butter, to get some hints. Or, if they have Kong toys, fill the hole in them with some peanut butter as a treat.
Quote:Nutritional Benefits of Peanut Butter
Typical dog food can be well supplemented by adding peanut butter to your dog's diet. Peanut butter is made of Vitamin H and Vitamin E. The first vitamin increases the sheen of your dog's coat, improves the quality of dog skin and the strength of the nails. The second helps your dog's immune system, which protects your dogs from disease.
http://www.vetinfo.com/feeding-dog-peanut-butter.html
When my dog was a puppy and young dog, she loved peanut butter. I'd fill the center of a knuckle bone with it and she'd happily work at getting every smidgen out until that bone was as clean as a whistle. She also loved peanut butter flavored edible chew bones. For some reason, she lost her taste for it as she got older, but she really used to like it.
Do your dogs like peanut butter? Have you ever given it to them?