K&H has designed a Mother’s Heartbeat Puppy Fleece Crate Pad with a removable Mother’s Heartbeat device. Maternal heartbeat speeds vary between breed sizes. The Mother’s Heartbeat devices are based on estimated heartbeats of the breed of the parents and puppy. Included device installs into the pocket at the front of the crate pad. The soft polyester fleece keeps puppies cozy while the maternal heartbeat helps to calm them. Can help everyone get a good night’s sleep.