Specifications: It is made from eco-friendly plastic materials which can keep breathable and comfortable. Adjustable neck strap allows you to quickly adjust fit size for your dog and make sure it remain tightly. You can use it to decorate your dog in special festival. Your dog can pant, drink due to the wide holes of the mouth cover.  With this mouth cover, you can effectively prevent dogs from biting, messy barking.   Item Name: Puppy Mouth Cover Material: Plastic Features: Breathable, Adjustable, Durable, Pet Supplies, Anti-barking 1 Size: 6cm x 6cm x 6cm/2.36" x 2.36" x 2.36" (Approx.) [Our Size 2] Top Width: 4cm/1.57", Top Height: 4.5cm/1.77", Bottom Length: 7.5cm/2.95", Bottom Height: 7cm/1.57", Suitable Collar: within 32cm/12.60" (Approx.) 3 Size: 8.5cm x 8cm x 8cm/3.35" x 3.15" x 3.15" (Approx.) [Our Size 4] Top Width: 5cm/1.97", Top Height: 6cm/2.36", Bottom Length: 9.5cm/3.74", Bottom Height: 9.5cm/3.74", Suitable Collar: within 40cm/15.75" (Approx.) 5 Size: 12cm x 11cm x 11cm/4.72" x 4.33" x 4.33" (Approx.) [Our Size 6] Top Width: 5.5cm/2.17", Top Height: 8.5cm/3.35", Bottom Length: 14cm/5.51", Bottom Height: 13.5cm/5.31", Suitable Collar: within 56cm/22.05" (Approx.) 7 Size: 15cm x 14.5cm x 14.5cm/5.91" x 5.71" x 5.71" (Approx.)   Notes: Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.   Package Includes: 1 x Puppy Mouth Cover