Small dogs have big voices, and they deserve tech that's tailored to their size. NanoBark 2.0 Bark Collar is built for dogs with neck sizes 4 to 15 inches and helps stop nuisance barking, so you can enjoy a peaceful home together. With a long-lasting battery and a comfort-first fit, NanoBark 2.0 Bark Collar for small dogs is perfect for apartments, houses, or anywhere in between. The slim, low-profile bark collar features a snug new fit with an updated design for extra flex and durability. Delivering the minimum effective level of correction for max results, it only responds to your dog's unique voice and tunes out the neighborhood noise. With 10 levels of auto-adjusting static correction, the bark collar helps prevent your dog from growing desensitized with patented Variable Pulse technology. The long-lasting battery stays charged for up to 7 days, and the waterproof design means you can enjoy puddle play with ease. Note: This product uses static correction. If another type of correction is desired, PetSafe offers a variety of collars that use other forms of correction, including tone and spray. Since 1988, PetSafe has been driven by a simple belief: safe, healthy pets lead to happier lives for pets and their families. For over 25 years, we've been dedicated to enhancing the lives of pets and the people who love them, treating every pet as a cherished family member and delivering life-changing innovations designed to enrich every moment. With U.S. roots and a global reach, our vet- and trainer-recommended products are built for every pet and backed by exceptional customer support. From backyards to dog parks, we're on a mission to create fields of joy for happy, healthy, and safe pets.