Seasonal & Outdoor · Explainer
How to Measure a Dog for a Coat or Sweater
The short version
- Most dog clothing charts need three numbers: back length, chest girth and neck girth. Chest girth is usually the most important [1].
- Measure with your dog standing naturally, and leave room for two fingers under the tape on every girth [1].
- If your dog is between sizes, choose the larger one [1].
- Sizing differs by brand and even by style, so compare your numbers with each product's own chart, not a general size name [1].
- A coat should let your dog walk, run and play comfortably, and should not be so loose it could tangle [2].
Why measure first
Breed names and weight are poor guides to coat size. The AKC says sizing differs by brand and even by style within a brand, so the same dog can be a Medium in one coat and a Large in another [1]. The brands in our roundups say the same: Kuoser and Spark Paws both tell buyers to measure and size up if in doubt, and the Carhartt chore coat lists overlapping chest ranges across sizes.
The payoff is fit. The AKC says a dog should be able to walk, run and play comfortably in a jacket, and that it should not be so loose it could tangle [2]. Five minutes with a tape measure avoids a return.
The three measurements
The AKC says most dog clothing needs three numbers: back length, chest girth and neck girth, and that chest girth is usually the most important [1]. Take them in this order, with your dog standing naturally on a flat floor [1].
- Chest girth: wrap the tape around the widest part of the rib cage, usually just behind the front legs, keeping it level and close [1].
- Back length: run the tape along the spine from the base of the neck, where the collar sits, to the base of the tail [1].
- Neck girth: wrap the tape around the base of the neck, where a collar normally sits [1].
- On each girth, leave room for two fingers under the tape [1].
- Write all three down, then compare them with the chart for the coat you want [1].
No tape measure? The AKC suggests a piece of string or a shoelace: wrap it, mark it, then lay it against a ruler [1].
Chest girth
Chest girth is the number most charts lead with, and the AKC calls it usually the most important [1]. Find the widest part of the rib cage, which is usually just behind the front legs, and keep the tape level all the way around and snug against the coat without squeezing [1].
Then apply the two-finger rule: you should be able to slide two fingers between the tape and your dog [1]. That built-in slack is why you should not pull the tape tight, and why a coat sized to a tight measurement ends up restricting the shoulders.
Some makers only size by this one number. IECOii, for example, sizes its harness coat by chest girth rather than breed or weight, and Carhartt lists each size as a chest range.
Back length and belly cut-outs
Back length runs along the spine from the base of the neck, where the collar sits, to the base of the tail [1]. Keep the tape on the spine rather than following the curve of the side, and stop at the tail base, not the tip.
This number decides how much of your dog the coat covers. The ASPCA suggests that a sweater or coat for a short-haired dog cover from the base of the tail to the belly, with a high collar or turtleneck [2]. The AKC adds a practical note for male dogs: a coat without a belly cut-out may need a shorter underside to avoid soiling [1]. Sanitary cut-outs are on the AKC's list of features to look for [2].
Neck
Neck girth goes around the base of the neck, where a collar sits [1]. The two-finger rule applies here too [1]. On a pullover sweater with no closures, the neck opening also has to go over the head, so a snug neck measurement matters more than it does on a coat that opens flat and closes with straps.
If the coat has a turtleneck or high collar, which the ASPCA suggests for short-haired dogs [2], check that the collar height does not push into the ears or jaw when your dog looks down.
Between sizes and brand charts
When your dog falls between two sizes, the AKC says to choose the larger [1]. The brands agree: Kuoser and Spark Paws both tell buyers to size up if in doubt.
Compare your numbers with each product's own chart, not with the size you bought last time. The AKC says sizing differs by brand and even by style [1]. Two of the coats we looked at show why: Carhartt lists its Large as a 25 to 38 inch chest and its Extra Large as 30 to 45 inches, so a 32-inch chest fits both ranges on paper, and the Kuoser chart lives in the listing images rather than the text.
If you are shopping for one of our picks, see our dog winter coat guide for insulated and waterproof coats and our dog sweater guide for lighter layers. If your dog wears a harness under its coat, measure for the harness separately; our no-pull harness guide covers that.
Fit check and introducing the coat
When the coat arrives, put it on indoors and watch your dog move. The AKC says the dog should be able to walk, run and play comfortably, and the coat should not be so loose it could tangle [2]. Check that the leg openings do not rub, the collar does not ride up over the ears, and the belly strap or underside does not interfere with going to the bathroom.
Introduce it gradually and positively, the AKC says, and not for the first time outdoors [2]. Keep the dog calm with treats, as the AKC suggests for measuring sessions too [1]. Once the coat is in use, the AVMA suggests keeping more than one on hand so each outing starts with a dry one, because a wet garment makes a dog colder [3], and the AKC says to wash coats regularly because they collect hair and dander and can harbor bacteria if stored damp [2].
Questions pet parents ask
What measurements do I need for a dog coat?
Back length, chest girth and neck girth, per the AKC, with chest girth usually the most important [1]. Most charts list all three.
Where do I measure a dog's chest?
At the widest part of the rib cage, usually just behind the front legs, with the tape level and close and room for two fingers underneath [1].
How do I measure a dog's back length?
Along the spine from the base of the neck, where the collar sits, to the base of the tail [1]. Stop at the base of the tail, not the tip.
What if my dog is between sizes?
Choose the larger size, the AKC says [1]. Several brands say the same in their listings.
Can I size a dog coat by breed or weight?
Not reliably. The AKC says sizing differs by brand and even by style, so compare your dog's measurements with each product's chart [1]. Some makers, such as IECOii, size by chest girth only.