Diggs Groov Crate Training Aid Blush Dog TrainingDiggs' Groov Crate Training Aid is a crate attachment meant to encourage licking, which is proven to have a calming effect on dogs. It's a great tool to enrich your pet's lifestyle and reduce crate anxiety. Use in combination with Diggs' spreadable treat or other great snacks to give your pup a stress free fun time. FEATURES AND BENEFITS Includes freezer shell to create a delicious frozen treat Designed for use with a spreadable treat Works with Revol