Product Sizing Chart

Tiny XXS XS Small Medium Large
Bill Width 3.35" 3.85" 4.5" 5.25" 5.9" 6.4"
Head Width 2.5" to 3.25"  3" to 3.85" 3.75" to 4.5" 4.25" to 5.25" 5" to 6" 5.75" to 6.5"
Neck Size 8 to 10 inches 10 to 12 inches 12 to 15 inches 14 to 16 inches 15 to 18 inches 17 to 21 inches
Approx. Weight up to 7 lbs. 7 to 14 lbs. 13 to 25 lbs. 22 to 45 lbs. 40 to 65 lbs. 60 to 100 lbs.

 

Size Popular Breeds
Tiny Chihuahua (smaller), Maltese (smaller), Pomeranian (smaller), Toy Poodle, Yorkshire Terrier
XXS Brussels Griffon (smaller), Chihuahua (larger), Italian Greyhound, Jack Russell (smaller), Maltese (larger), Mini Dachsund, Papillon, Pomeranian (larger)
XS Boston Terrier (smaller), Brussels Griffon (larger) Cavalier King Charles Spaniel, Cocker Spaniel (smaller), French Bulldog (smaller), Jack Russell Terrier (larger), Pug (smaller), Shiba Inu (smaller), Shih Tzu (larger)
West Highland Terrier
Small Australian Shepherd (smaller), Beagle (smaller), Border Collie (smaller), Boston Terrier (medium), Cocker Spaniel, French Bulldog (medium), Pug (larger)
Medium Australian Shepherd (larger), Beagle (larger), Border Collie, Boston Terrier (larger), Boxer, Doberman Pinscher (smaller), French Bulldog (larger), Golden Retriever (smaller), Greyhound, Labradoodle, Pit bull (smaller)
Large Akita, American Bulldog, Bernese Mountain Dog (smaller), Cane Corso, Doberman Pinscher (larger), English Bulldog, German Shepherd, Great Dane, Labrador Retriever (larger), Pit bull (larger), Rottweiler, St. Bernard (smaller)