I don't know what kind of sensitivities your dog has but here is the ingredient list below (thanks , google):
Our chews are made from wholesome ingredients and do not contain any plastics. They are made from natural cornstarch, which assures that the bones offer a healthy and dissolvable alternative to nylon chews.
Additionally, Booda Bones contain only natural colors and flavors.
Ingredient List: Modified food starch, water, glycerin, sorbitol, powdered cellulose, dried yeast hydrolysate, lecithin, calcium stearate, sorbic acid (preservative), color added (caramel, carmine), natural flavor.
thanks for the website have you bought the Dehydrated Duck Feet they say Product Description
Duck feet dog treats are a great, natural source of glucosamine and chondroitin. No preservatives, yeast, soy, chemicals, salt, sugar, or grains. Just pure, dehydrated USA-sourced meats
Hypo-allergenic! No grains or additives to irritate your pet’s skin or upset your dog's system.