Please measure your dog's snout to insure this is the correct muzzle size you need(see the size map of the picture to get more detail).
How to measure your dog for these muzzles:
Measure the circumference midway between the tip of the snout and eyes, under the chin and over the top of your dog's muzzle.
Size 1: Snout 7-8"(18-21cm) , Support /3.3-11 lbs(1.5-5kg)
Size 2: Snout 8-10"(21-26cm),Support/8.8-27.5 lbs(4-12.5kg)
Size 3: Snout 10-12"(26-30cm),Support 22-55 lbs(10-25kg)
Size 4: Snout 12-13.5"(30-34cm),Support/49.6-82.6 lbs(22.5-37.5kg)
Size 5: Snout 13.5-14.5"(34-37cm),Support/82.6-121 lbs(37.5-55kg)
Size 6: Snout 15-17"(38-43cm),Support/121-154 lbs(50-70kg)
Color: Black, Red
JWPC Adjustable Anti-biting Dog Soft Silica Gel Muzzle Breathable Safety Pet Puppy Muzzles Mask for Biting/Barking/chewing - B0719V9N6Q