Happy Trails Barkery Peanut Butter Lover treats are all natural and are sure to please even the the most finicky of pooches. They are made with the finest all-natural ingredients (never containing Xylitol as it is toxic to dogs), and have a lovely strong smell of peanut butter that dogs absolutely love.For your pooch, this means that they’re getting a great source of protein. Peanut Butter is also a great source of Vitamin E.