To pick a dog jacket for a broad chest and short back, measure the chest and the back length on their own. Then check both numbers against that exact jacket's size chart. Don't size up just to get more room at the chest if it leaves extra fabric hanging past a short back.
If no size on the chart fits both numbers, look at a different cut and check its chart the same way. After that, a short try-on at home tells you whether to keep the jacket.
Measure chest and back length separately
Take two measurements and write each one down. Don't fold them into a single size label. The AKC explains how to measure the back and chest separately while your dog is standing:
Back length: Run the tape along the top of the spine. Start at the base of the neck, where it meets the body and a collar usually sits. Stop at the base of the tail, not the tip.
Chest girth: Wrap the tape around the widest part of the rib cage, usually just behind the front legs. Keep it snug but not tight.
A broad-chested, short-backed dog will often have a large chest number next to a fairly small back number. That gap is the whole reason to keep the two numbers separate. A single size label can't show it.
Some jacket charts give their own measuring points or method. If yours does, follow that chart's instructions for that jacket. If you want pictures for each step, our dog measurement guide shows where to place the tape.
Compare both measurements with the jacket's own chart
Look up chest girth and back length on the chart for the jacket you actually want instead of relying on a size from another style. The AKC notes that designs and sizing vary by brand and design, so check the exact jacket's chart even if you have purchased from that brand before. For our cold-weather styles, start with the cold-weather size chart.
Use this order to decide:
Find each number on the chart. Note which size matches the chest and which size matches the back length. If both point to the same size, that size is the one to try.
Don't fix a mismatch by sizing up for the chest alone.Clothing sizing has to account for chest and back length. A bigger size that fits the chest but runs long on the back only solves half the problem. The extra length can bunch or hang where your dog doesn't need it.
Check another cut against its own chart. Some styles size length and girth differently. Consider a different cut only when its chart fits both of your dog's numbers better. If none fits both, the try-on below will show you which compromise bothers your dog least.
The try-on is your final check. Stay with your dog while they wear the jacket, and look for these practical signs.
Standing still: Look for pulling across the chest or shoulders. Check that fabric isn't rubbing or digging in at the armpits. Watch for fabric bunching or hanging along the back.
Moving around: Have your dog walk, turn, and sit. See whether the jacket shifts, twists, rides up, or drags.
If the chest pulls, that size or cut is too tight through the girth. If the back bunches or hangs past the tail base, the jacket is too long for your dog. Either way, go back to the chart and try a different size or cut. Don't keep a jacket just because the label matches. If the jacket twists to one side when your dog walks, our guide to stopping coat slippage walks through what to check next.
FAQs
Why does chest girth matter so much for jackets?
Chest girth goes around the widest part of your dog's body. The AKC calls it typically the most important measurement for clothing and harnesses. If the chest doesn't fit, the jacket won't sit right no matter how good the length is.
How snug should the tape be?
Snug, but not tight. The AKC suggests the two-finger rule: you should be able to slide two fingers between the tape and your dog for a comfortable fit.
Do I need any other measurement besides chest and back?
Yes, often. The AKC lists neck girth along with back length and chest girth as the key measurements for sweaters, jackets, and raincoats. Take it too, in case the jacket's chart asks for it.
Should a male dog's jacket fit differently underneath?
Possibly. The AKC notes that if a garment has no belly cutout, a slightly shorter fit underneath can help prevent accidents. Keep this in mind when you check length on a male dog.
About the author
Elowen Sage
Lead Pet Wardrobe StylistSmall Breed Lifestyle ExpertCozy Care Advocate
Elowen Sage brings a rare eye for texture and detail to fitwarm. As a Pet Wardrobe Stylist, she looks beyond the mainstream, curating pieces that blend gentle care with quiet luxury for small breeds. Elowen treats every garment as a hug for your pet, ensuring that style never comes at the cost of comfort.
