Sizing by Breed

Crate size scales from weight. Collar and harness size does not, and treating them the same way is how badly fitting gear gets bought.

Crates: the weight chart is real

Every crate manufacturer uses the same size steps — 18, 24, 30, 36, 42 and 48 inches — and the weight bands behind them are consistent across brands. A crate should let the dog stand without ducking, turn around, and lie fully stretched. Bigger than that is not kinder; for house-training it is actively worse, because a dog will use one end of a too-large crate and sleep in the other.

Long-backed breeds break the weight rule. A dachshund or a corgi needs a crate sized by body length, not by the number on the scale.

Collars and harnesses: measure, do not calculate

Two dogs of the same weight can differ by four inches of chest girth. A barrel-chested bulldog and a deep-narrow-chested vizsla weigh similarly and take completely different harnesses.

So these pages give a range by size group and then tell you to measure. A number that pretends to precision it does not have is worse than no number.

Coat changes every measurement

Double-coated breeds — samoyeds, huskies, shelties, bichons — read three to four inches high on girth if you measure over the fur. Part the coat and measure to the skin.

Harness, not collar, for some breeds

Flat-faced breeds and those prone to tracheal collapse — pugs, French bulldogs, Boston terriers, chihuahuas, yorkies, pomeranians — should walk on a harness. A collar restricts an airway that is already compromised, and the risk is not theoretical.

Long-backed breeds with IVDD risk want a harness for a different reason: a collar puts all the leash force into the neck and spine.