| Size | Back Length (cm) | Tummy Depth (cm) | Chest Depth (cm) | Breed Fit (Guide Only) |
| XXXXS | 25 | 17 | 5 | Puppies, Tea Cup Breeds, Chihuahua |
| XXXS | 30 | 19 | 6 | Yorkshire Terriers, Miniature Dachshunds, Shih Tzu, Bichon Frise |
| XXS | 35 | 20 | 6.5 | Jack Russell, Pug, Miniature Schnauzers, Westie |
| XS | 40 | 23 | 7 | Schnauzer, Border Terrier, Cavalier, Pug |
| S | 45 | 26 | 8 | Bull Terriers, Poodles, Cocker Spaniels, Beagle, Corgi |
| M | 50 | 29 | 9 | Basset Hound, Springer Spaniel, Bull Dog |
| L | 55 | 33 | 10 | Boxer, Pointer, Labrador, Poodle |
| XL | 60 | 35 | 12 | Golden Retriever, Airedale, German Shepherd |
| XXL | 65 | 37 | 14 | Rottweiler, Doberman, Weimaraner, Mastiff |
