Understanding Why Your Pet Chews: Pets chew for various reasons; teething, exploration, separation anxiety, boredom and stress. Chewing is a natural animal behavior, so the goal is to effectively train your pet to chew on appropriate objects. Be sure your pet has appropriate chewing toys such as a Kong or Nylabone. How Bitter Yuck! Works: To most pets, Bitt Yuck! has an unappealing taste, making chewing on the particular sprayed object unpleasant and decreasing the unwanted behavior. Due to the complexities of taste preferences and behavior issues, results may vary. It is important to monitor your pet's reaction to Bitter Yuck! Be sure your pet is deterred by the taste before leaving them alone with the object sprayed.