The collar can be adjusted to fit a range of neck sizes for dogs 10 to 100 pounds. (geekwrapped.com)
In fact, it's suitable for dogs with neck sizes ranging from 3 - 25 inches. (geekwrapped.com)
Made for little dogs but can be used to help control barking with dogs that weigh up to 55 lbs; collar strap will fit neck sizes up to 20 inches. (americas-pet-store.com)