Size: L neck 16-28cm, mouth 18-30cm; XL neck 20-30cm, mouth 23-34cm; XXL neck 22-35cm, mouth 28-38cm. Humane way to prevent biting and unwanted chewing. This muzzle is designed to restrict your dog's ability to bite, chew, and bark while allowing your dog to breathe, pant, and drink water. Includes a bonus collar and connection strap to help secure the muzzle in place. The secure fit makes it easy to keep your dog's muzzle firmly positioned, even for active dogs. Easily attach it to your dog's existing collar or use the included bonus collar for additional support. Features high-quality sliders for precise adjustments—no cheap plastic buckles—ensuring a reliable and comfortable fit that stays in place over time. Excess strap length can be neatly secured with hook and loop fasteners to eliminate loose ends.