Generaly fits breeds such as Border Terrier, Jack Russell Terrier, Miniature Poodle, Miniature Schnauzer & Shetland Sheepdog.
The Italian Basket Dog Muzzles will allow the dog to breath freely, pant and drink water.
This dog muzzle also has a removable front grill that allows for added adjustment.
These flexible polyethylene (plastic) basket muzzles will discourage dogs from chewing and swallowing undesirable objects.
Circumference of the size 4 is 9 inches.
Length is 2-1/2 inches.
Please measure your dogs snout.
How to measure:
Circumference - measure approximately 1/2" below his eyes around the snout.
Note: order the muzzle that is 3/4" to 1" bigger than the exact circumference of the dogs snout.

Click Here for Italian Basket Muzzle Size Chart.