These are the standard sizes listed and measurements are as follows :-
10"/25cm Length has a 11”/28cm girth/chest
11”/28cm Length has a 12”/30cm girth/chest
12"/30cm Length has a 13"/33cm girth/chest
13”/33cm Length has a 14”/36cm girth/chest
14"/36cm Length has a 15"/38cm girth/chest
15”/38cm Length has a 16” /41cm girth/chest
16"/41cm Length has a 17" 43cm girth/chest
17”/43cmLength has a 18”/46cm girth/chest
18"/46cm Length has a 19"/48cm girth/chest
We recommend measuring your dog 3 times before placing an order for accuracy.