Dog size guide for crates, beds, harnesses and leashes
Turn your dog's weight and measurements into a starting size for a crate, bed, harness and leash.
Runs entirely in your browser: nothing you enter is sent to this site. Results are estimates for planning, not veterinary advice.
What it does
Enter your dog's weight, its length from nose to the base of the tail and the girth of its chest. The guide suggests a crate size, a minimum bed length, a harness size and a leash length and width.
How the numbers are worked out
The crate suggestion is the larger of two answers. One is the common retail size for the dog's weight: an 18 inch crate for dogs up to about 12 pounds, then 24, 30, 36, 42 and 48 inch crates for dogs up to about 25, 40, 70, 90 and 110 pounds. The other is the smallest standard crate at least as long as the dog. A crate should let a dog stand, turn around and lie down, and it should not be so big that a puppy uses one end as a toilet.
The bed is the dog's length plus about eight inches. The harness size comes from the chest girth, with typical bands from extra small for a chest up to 14 inches to extra extra large above 42. The leash is a six foot fixed length, and its width grows with weight, from three eighths of an inch for the smallest dogs to an inch for very big ones.
Where it stops being right
Sizes differ between brands, and a deep-chested, long-legged or very furry dog can fit badly into a size chosen from weight alone. Use the guide as a starting point, read the maker's size chart and try the item on your dog: two fingers should slide under every harness strap, and nothing should rub.
A growing puppy will outgrow a harness in weeks. Buy a crate with a divider and an adjustable harness, and measure again every month or two.
Last reviewed November 8, 2026