PERFECT DESIGN -- Breathable mesh design with tongue, puppy can breathe freely. Triangle fixed, more firm and anti-drop. Effectively prevent biting, chaotic, chewing. High-quality material--The dog mouth is made of environmentally friendly PVC material, no smell, breathable and comfortable, the edge fabric is soft and wear-resistant, no harm to the skin. ADJUSTABLE STRAP -- The dog muzzle has an adjustable strap that allows you to adjust the strap for a perfect fit to keep it stable and ensure it won't be removed by your dog. For Long Nosed Dogs -- This safety muzzle is ergonomically designed for dogs with long noses. Suitable for golden retriever, border collie, german shepherd, labrador, corgi and other long-nosed dogs. Size selection (M size is sent by default) -- please refer to the size chart to choose the appropriate size according to the dog's weight and mouth circumference. Any questions, please feel free to contact us.