Why not just give them an ear of corn to chew on?
Feeding Beneful?
INGREDIENTS
Ground yellow corn, chicken by-product meal, corn gluten meal, whole wheat flour, animal fat preserved with mixed-tocopherols, chicken, soy flour, rice flour, propylene glycol, sugar, tricalcium phosphate, salt, phosphoric acid, potassium chloride, animal digest, mono and dicalcium phosphate, dried carrots, sorbic acid (a preservative), dried tomatoes, avocado, calcium propionate (a preservative), L-Lysine monohydrochloride, choline chloride, Vitamin E supplement, zinc sulfate, ferrous sulfate, Yellow 5, manganese sulfate, niacin, Red 40, Vitamin A supplement, Blue 2, copper sulfate, Vitamin B-12 supplement, calcium pantothenate, thiamine mononitrate, garlic oil, Yellow 6, pyridoxine hydrochloride, riboflavin supplement, Vitamin D-3 supplement, menadione sodium bisulfite complex (source of Vitamin K activity), calcium iodate, folic acid,
Here’s an offer you should look at. Give them some real meat instead of corn!