The size 3 generally fits breeds such as Bichon Frise & Standard Dachshund and similar size dogs.
Circumference of size 3 is 8-1/2 inches.
Length is 2-1/2 inches.
Note: order the muzzle that is 1/2 to 3/4 of an inch bigger around than the exact circumference of the dogs snout.
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(lower 48 states).