CrittEar Dog Earplugs Offer Relief For Your Anxious Dog This Holiday Season. CrittEar has produced the first patented in-ear dog earplugs that provide hearing protection for dogs–called Calm. Calm features revolutionary sound quieting technology, matched with an ergonomically-perfected design to provide dogs sleek, custom-fit hearing protection. Calm allows dog owners to protect their dog’s sensitive hearing while they also provide a sense of ‘calm’ and comfort during anxiety-provoking situations.