|  Sizing: Measure your dog’s snout from the tip of his nose to the "stop" as shown above, and around the widest part of his snout while his mouth is closed. Please note: returns and exchanges require a $5 restocking fee. If you are unsure of which size to purchase, please contact the manufacturer at JAFCOMUZZLES@AOL.COM or 800-742-0389. When calling please let the company know that you will be ordering from Pet Expertise and be ready with your dog’s breed, weight, and snout measurements. | Size | Snout Length | Snout Circumference | Example Dog Breeds | | #0 (New Size!) | 1.5 to 2" | Under 8" | Chihuahua, Miniature Pinscher | | #1 | 2 to 2.75" | 6 to 8" | Jack Russell Terrier | | #2 | 2.5 to 3" | 7 to 9" | Beagle, Cocker Spaniel | | #3 | 2.5 to 3.5’’ | 8.5 to 10.5" | Lab, Golden, Small German Shepherd | | #3 with 3 Straps | 2 to 3.25 | 8.5 to 10.5" | Pitbull, Boxer | | #4 | 3.75 to 4.5" | 8 to 12" | German Shepherd | | #5 | 3.5 to 4.25" | 13.5 to 15.5" | Mastiff, Great Dane | | #4S | 3.5 to 4.5" | 9 to 12" | Small Rottweiler, Pitbull | | #4R | 3.25 to 4.25" | 10 to 13.5" | Large Rottweiler, Pitbull | |