Get the right fit for your dog's gear

Enter your dog's breed, weight, and measurements. Get harness size, crate dimensions, and fit tips in seconds. No more guessing, no more returns.

Start Measuring

Why measuring matters

Sizing is not standard

A medium harness from Brand A might fit a 25 lb dog. Brand B's medium fits a 45 lb dog. The labels mean different things everywhere. Your dog's actual measurements are the only reliable starting point.

Crate fit affects behavior

A crate that's too small causes anxiety. Too big and a puppy might use one end as a bathroom. The right size lets your dog stand, turn, and lie flat with a couple of inches to spare.

Grow with your dog

Puppies change fast. A 12-week-old Labrador might need a new harness every month. Save your dog's profile here and come back to update measurements as they grow.

Measure your dog

Dog profile
Enter weight in pounds
Widest part of ribcage, behind front legs
Base of neck to base of tail
Optional, where collar sits

How to measure

A — Body length
Base of neck to base of tail, along the spine.
B — Chest girth
Wrap tape around the widest part of the ribcage, just behind the front legs. Snug but not tight.
C — Neck
Where a collar would sit. Keep one finger of space between tape and neck.

Your recommendations

Fill in your dog's details and click Get Recommendations to see harness sizes, crate dimensions, and fit tips here.

Common mistakes and fit tips

Measuring a wiggly dog

Have someone offer treats while you measure. If your dog won't stand still, measure while they're lying on their side. For chest girth, wrap the tape around and slide it into place during a calm moment. Two quick measurements are better than one long struggle.

Harness too tight

You should fit two fingers flat between the harness and your dog's chest. If you can't, it's too tight. Watch for chafing under the arms after the first walk. Red marks mean you need a bigger size or an adjustment.

Harness too loose

If your dog can back out of the harness, it's too loose. Step-in harnesses should hug the chest without gaping. Front-clip harnesses need the chest strap sitting flat against the breastbone, not sliding to one side.

Crate training basics

Start with short sessions. Feed meals inside the crate with the door open. Never use the crate as punishment. A properly sized crate feels like a den, not a cage. Most dogs adjust within a week or two.

Puppy growth spurts

Large breed puppies can gain 2-3 pounds per week. Check harness fit every two weeks. An adjustable harness with multiple adjustment points will last longer than a fixed-size one. For crates, buy the adult size and use a divider.

Double-check before ordering

Brand charts vary. Use PupFit's recommendations as a starting point, then check the specific brand's size chart on their website. If your dog is between sizes, read reviews from owners with similar breeds to see if the brand runs large or small.

Saved dog profiles

Your dog's profiles are saved in this browser. Come back anytime to update measurements or check sizing for new gear.

No saved profiles yet. Use the form above and click Save Profile.

Questions dog owners ask

How do I measure my dog's chest girth?

Wrap a soft tape measure around the widest part of your dog's ribcage, just behind the front legs. The tape should be snug but not tight. Your dog should be standing. If you don't have a tape measure, use a string and measure the string with a ruler.

My dog is between sizes. Which should I pick?

For harnesses, go with the larger size if your dog is still growing or if the measurement falls right at the boundary. Most harnesses are adjustable by a few inches. For crates, always size up so your dog can stand, turn around, and lie down comfortably.

Can I use this for puppies?

Yes, but puppies grow fast. Measure every 2-4 weeks and update the profile. Consider buying an adjustable harness that fits a range of sizes rather than a fixed size.

Why do crate sizes seem too big?

Crate sizing includes room for your dog to stand up, turn around, and stretch out. If the crate seems large, that's correct. A crate that's too small causes stress and discomfort. Some owners use dividers for puppies and remove them as the dog grows.

Do harness sizes match across brands?

Not exactly. Each brand uses its own measurements for XS, S, M, L, and XL. That's why PupFit gives you the measurement range for each size so you can compare against any brand's chart. Always check the brand's specific chart before buying.