Measure from the base of your dogs neck to the base of their tail.
| Size | Length | Breeds |
| 1 | 7-8" | Puppy, Chihuahuas |
| 2 | 9-10" | Pomeranian, Yorkshire, Miniatures, Chihuahuas |
| 3 | 11-12" | Toy Poodle, Maltese |
| 4 | 13-14" | Pug, Beagle, Poodle |
| 5 | 15-16" | Shih Tzu, Terriers |
| 6 | 17-18" | Jack Russel, Dachshunds |
| 7 | 19-20" | Bull Terriers, Bull Dogs |
| 8 | 21-22" | Boxer, Chow Chow |