Enrivik Small Remote Dog Training Collar with Beep and Vibration Modes for Pet Behavior Training - Suitable for Extra Small, Medium or Large Dogs (5+ lbs)FOR EVEN THE SMALLEST PETS: While other training collars say "fits small dogs" but end up being huge for them. The Envirik remote collar has an adjustable collar (8 26") making it suitable for all dogs over 5 lbs including chihuahuas and bichons DOG TRAINING GUIDE: Each order comes with a full user manual including how to teach basic commands, how to use the remote collar in a safe and efficient manner and how to effectively use positive reinforcement