Best way to measure your pups neck size. measure existing dog collar from tip of a buckle, including buckle, to comfy hole.
How to measure what size belt you need. Opt.1 Your jeans size (or your waist line) +5.5cm (2.5") Eg. your jeans size 32''+2.5" you should look for 34.5" Size 'S' or 'M' Opt.2 Measure your thickest belt belt from tip of a buckle (include buckle) to comfy hole. Eg. total measurement comfy hole including buckle 36'' Your size is 'M' or 'L'