You are welcome to read our full review of the Royal Pet USA Dog Training Collar. We recommend this training collar for anyone nearing desperation with pets afflicted with “small dog syndrome” or if you are short on time and patience to follow a more positive reinforcement route to dog training. It won’t harm your dog and gives you plenty of options to choose from before having to apply some negative reinforcement that the dog will find too uncomfortable. It comes with an excellent lifetime warranty.