I use Bil Jac Liver treats. Not sure if they'd do the trick.
Ingredients:
Liver, Chicken By-Products, Chicken By-Product Meal, Corn, Chicken Fat, Glycerin, High Fructose Corn Syrup, Propylene Glycol, Wheat Flour, Phosphoric Acid, Salt, Sodium Propionate and Potassium Sorbate and BHA and Citric Acid (Preservatives), Iron Oxide.
Guaranteed Analysis:
Moisture (maximum) 30
Crude Protein (minimum) 25
Crude Fat (minimum) 10
Crude Fiber (maximum) 2