BREED SIZE: Simply choose the breed size calming pillow that is right for your pet, 3 dog breeds sizes available HEARTBEATS: Unique heartbeat rhythm designed to mimic the mother's heartbeat of each specific breed size CALMING: Mother's heartbeat helps pets transition to your pet's new home and reduces anxiety and stress MACHINE WASHABLE: Calming pillow includes a machine washable bone shaped pillow and a removable heartbeat device TRAINING: Calming heartbeat puppy toy helps reduce negative puppy behavior; less barking/whining during crate training BRAND YOU TRUST: Designed by K&H with OVER 20 years of experience in creating safe, innovative, quality products for pets