Picking the right size:
Measure your dog’s width/girth by wrapping a tape measure around your dog’s chest, just behind the front legs. As show in the diagram below -G-
||Teacup breeds, puppies
||Chihuahua, Pomeranian, Shitzhu
||Jack Russell, Miniature Poodle, Sheltie
||Boston Terrier, Beagle, Pug, Lhasa Apso, Westie
||Border Collie, Springer Spaniel, American Staffordshire Terrier
||Boxer, Bulldog, Dalmatian
||German Shepherd, Labrador Retriever, Rottweiler
||Greyhound, Great Dane
Fitting The Harness:
Open the quick-snap buckle on the belly strap.
Place the shoulder strap over the dog's head with the chest strap resting on the dog's chest.
Tighten belly strap to a comfortably snug fit. On medium-sized dogs, only allow room for about a finger's width under the strap.
Allow a bit more for larger dogs, less for smaller dogs.
Gently press fingers on the lower part of the front of the dog's chest to locate the breastbone.
Adjust the shoulder strap so that when the chest strap is horizontal parallel to the ground, the chest strap rests directly over the breast bone.
AFTER you have tightened both the shoulder and belly straps, adjust the chest strap to fit securely.
It should rest nearly parallel to the ground, not hang down or gap. You may need to remove the harness to make these adjustments.
When the shoulder strap is fitted correctly, the chest strap should resemble a horizontal line parallel to the ground, and it will rest directly over the breastbone.
Attach the leash to the D-ring on the chest strap.