Description
| SIZE | NECK SIZE | CHEST GIRTH | BACK LENGTH | WEIGHT | BREED EXAMPLES |
| XS | 6-8 | 13-14 | 8 | <3 | Teacups, Small Breed Puppies |
| S | 8-10 | 15-16 | 10 | 3-5 | Maltese, Chihuahua, Yorkshire Terrier |
| M | 10-12 | 17-18 | 12 | 6-8 | Pomeranian, Miniature Pinscher, Miniature Dachshund |
| L | 12-14 | 18-19 | 14 | 9-15 | Bichon, Toy Poodle, Miniature Pinscher, Miniature Dachshund |
| XL | 14-16 | 19-21 | 16 | 15-20 | Havanese, Pekingese, Japanese Chin |
| 2XL | 16-18 | 22-24 | 18 | 18-28 | Pug, Shih-Tzu, Miniature Poodle, Dachshund |
| 3XL | 18-20 | 23-25 | 20 | 25-40 | Westie Terrier, Jack Russell, French Bulldog |