The Nylabone Healthy Edibles WILD Natural Long Lasting Bison Flavor Dog Chew Treats are made with a longer-lasting, more digestible formula that is perfect for keeping your best friend satisfied. These treats are also USA made, so you can be sure they are safe and free from any artificial preservatives or colors. The Nylabone Healthy Edibles WILD Natural Long Lasting Bison Flavor Dog Chew Treats are available in a variety of flavors, including bison, which is a favorite among dogs.