The dog chew toy covered with spikes is to increase the force of friction, help to grind away plaque and loosen tartar in hard to reach places.
You may also apply a thin layer of treat paste such as peanut butter flavor, etc on the groove to prolong chewing time.
Best Gift - Dog Chew toys teach good chewing habits while satisfying the natural urge to chew and reduces their anxiety and boredom. To avoid dog bite shoes, sofa, desk, and chair because of tusks right out, assembly unnecessary damage.

What's in the box
1 x 3 Pack Pet Chew Toy For Dogs - Dog Chewing Toys with Bell