Size 0 - (Fits 4.5" Snout)
Size 1 - (Fits 5" Snout)
Size 2 - (Fits 5.5" Snout)
Size 3 - (Fits 6" Snout)
Size 4 - (Fits 8" Snout)
Size 5 - (Fits 8.25" Snout)
Size 3XL - (Fits 10.5" Snout)
Size 5XL - (Fits 10.25" Snout)