We use only very adjustable harnesses with a "step in system". We make them with a wider chest front part to make them much more comfortable and safer in case of a sudden pull of the leash. Most of the time the neck size of your dog or cat follows the size for the harness also. So if your dog is an S it can probably use a S harness too. Extra comfortable and practical. Can be used for cats but remember to tighten the straps extra carefully.
Minimum chest size (all around): 24 cm / 9,4 inches
Maximum chest size (all around): 33 cm / 13 inches
XXS/XS is only for the very tiny miniature breeds like Toy Chihuahuas. Can be good for pups of small breeds also.
The front part of harness is very small 10 x 10 cm / 3,9 x 3,9 inches
Minimum chest size (all around): 32 cm / 12,6 inches
Maximum chest (all around) 41 cm / 16,1 inches
XS/S fits most small breeds like the Yorkshires, Maltese, Italian Greyhounds.
The front part is 13 x 13 cm
Minimum chest size (all around): 39 cm / 15,4 inches
Maximum chest size (all around): 50 cm / 19,6 inches
S/M can we worn by a bit larger Pinschers, Bichon Frises, larger Pomeranias and similar breeds. The harness is very adjustable so it suits many smaller breeds well.