XS(Snout Cir 6¼"-7½"): The small dog muzzle is ideal for Jack Russell Terrier and so on(reference only), but not suitable for aggressive, over-active and flat-faced dogs such as Shih Tzu, Pitbull, Boxer, etc. Don't choose size based on breed, weight, or previous size. Be sure to measure and follow the size chart before purchasing. Your dog's snout circumference should fall within the size chart when you're choosing Hassle-available Service: If you have any concerns regarding sizing or product quality, either before or after your purchase, we are here to assist you. We aim to ensure you’re completely satisfied with your experience. Before wearing the muzzle, we recommend trimming your dog's nails to prevent scratching the product. Each muzzle comes with a user manual, please read it thoroughly before using Positive Training before Muzzling: When first using the muzzle, it's normal that your dog may resist and try to remove it several times. With consistent positive reinforcement like treats, your dog will adjust over time. Follow the training steps in the video or instructions to help ease anxiety and ensure a smooth transition. This muzzle is not meant for prolonged use and should always be supervised Breathable & Comfortable: Crafted from sturdy and breathable materials, our dog muzzles provide excellent ventilation for dogs to breathe, ensuring your dog's overall comfort during use. Thanks to the soft edges and its lightweight, the soft muzzle for dogs is skin-friendly and has zero pressure for dogs to wear Adjustable & Secure: Designed with a double hook and loop, this mesh dog muzzle is fully adjustable around the mouth and it is ideal for growing puppies. The quick-release buckle and slider buckle that is built-in for threading the extra part of the neck strap ensures the soft dog muzzle is easy to use and stays in place Dog-friendly Muzzle: Compared to a bulky basket or a fully closed muzzle, our open-snout puppy muzzle makes it easier for gear-shy dogs to accept something on their face. This humane dog muzzle allows dogs to pant, drink, and even be fed. Its ultimate comfort helps dogs reduce anxiety when cutting nails or bathing Great Helper in Your Life: If used properly, this large dog muzzle can help to prevent dogs from biting, nipping, destroying, fighting, and digging. Since it is quite lightweight and highly carry-on, the soft muzzle for medium sized dog are ideal for grooming, dog walking, muzzle training, vet visits, trimming nails, etc Mayerzon Dog Muzzle, Breathable Mesh Puppy Muzzles for Small Medium Large Dogs Jack Russell Terrier Dachshund Beagle Golden Retriever for Biting Chewing Grooming, with Adjustable Hook and Loop