To be sure you buy the correct sized garment please measure your pet carefully as instructed below & pick the correct size from the tables below.
Back Length -
Measure from base of neck down along the dog's spine to the tail-bone
Measure entire circumference of chest from the thickest/widest part (circumference of chest) usually right behind the front legs.
Measuring should be done where a collar would rest. Too tight will be uncomfortable for your pet!
Keep in mind your pets fluff factor! Give a little extra if your pet is extra fluffy as all that fur has to tuck into the clothes!