Size Large: Neck 15"-19", Width 1", DO NOT choose the size directly by feeling, please measure your dog's neck and refer to our neck range to find the best fit before ordering | This is a dog collar that perfects for training or controlling dogs. It tightens when dog pulls for better control and loosens when dog stops pulling, meanwhile it's no harm to your pet at all. | Quick release buckle design for easy on and off, it's made of eco-friendly plastic, durable and easy to release. The metal D ring and other accessories are chrome coated to add durability. | Made of high density nylon webbing which offers high strength and durability to this collar. It's lightweight so it doesn't burden the dog's neck and he would feel like nothing on it. | 2 reflective threads are stitched in upper and lower side of the nylon webbing, it can be visible at night, ensure your dog's safety at night. The loop is specifically designed for the purpose of attaching dog charms, tags, pendants or accessories. Please do not attach any dog leash with this loop.

Size Medium: Neck 12"-15.5", Width 4/5", DO NOT choose the size directly by feeling, please measure your dog's neck and refer to our neck range to find the best fit before ordering | This is a dog collar that perfects for training or controlling dogs. It tightens when dog pulls for better control and loosens when dog stops pulling, meanwhile it's no harm to your pet at all. | Quick release buckle design for easy on and off, it's made of eco-friendly plastic, durable and easy to release. The metal D ring and other accessories are chrome coated to add durability. | Made of high density nylon webbing which offers high strength and durability to this collar. It's lightweight so it doesn't burden the dog's neck and he would feel like nothing on it. | 2 reflective threads are stitched in upper and lower side of the nylon webbing, it can be visible at night, ensure your dog's safety at night. The loop is specifically designed for the purpose of attaching dog charms, tags, pendants or accessories. Please do not attach any dog leash with this loop.