How to Measure Your Dog for Clothing: Chest, Neck and Back Length

Tools and preparation: what to have on hand

A soft tailor’s tape measure is ideal because it follows contours; a piece of string and a ruler work as alternatives. Have treats, a helper and a towel or mat your dog prefers so they’ll stand calmly. Measure on a non-slippery surface with the dog standing squarely on all four feet; a seated or lying dog will give different numbers.

Before measuring, brush fur flat and account for coat thickness. For longhaired dogs, gently press fur down to the dog’s skin to find true body lines. Write down each measurement immediately and repeat measurements once to check consistency.

When measuring an excited or wiggly dog, enlist a helper to soothe and hold the dog steady while you measure. Use treats to reward calm behavior between steps. Measure at room temperature—a tense or hunched posture can affect the measurements you record.

Chest (girth): where and how to measure

Chest or girth is the most important single measurement for most dog garments. Locate the widest part of your dog’s ribcage—usually just behind the front legs. Wrap the tape measure all the way around that point, keeping it snug but not tight, so you can slide one finger underneath comfortably. Record the circumference in inches.

For deep-chested breeds like Greyhounds or narrow-chested breeds like Whippets, measure the broadest section; for barrel-chested dogs like Bulldogs, measure around the widest point as well. When converting girth to clothing sizes, prioritize this measurement over neck or back length because it determines whether the garment will slip on or be too tight around the body.

If your dog is between sizes, choose the larger size when in doubt for non-structured pieces like the Basic Dog Turtleneck Shirt, which has stretch. For very fitted garments with little stretch, consider a size up and plan for alterations or tailoring if needed. Write down both girth and an estimated weight for reference when checking size charts.

Neck measurement: collar vs. garment neck

Measure the neck where a collar would normally sit—at the base of the neck, just above the shoulders—not the narrowest part at the throat. Wrap the tape measure around this spot and allow about one finger’s width of slack (roughly 1 inch) so the garment won’t rub or constrict. Record the circumference.

Some garments, like the Basic Dog Turtleneck Shirt, have a higher folded neck; measure both the collar position and the higher neck line if the product has a tall turtleneck. For designs with elastic necklines or open collars, focus on the collar-line measurement to ensure the dog can put the garment on without struggling.

When measuring puppies or growing dogs, expect the neck to increase; choose adjustable or stretchier necklines, and check garments frequently for signs of tightness. Never leave any collar-like garment on unsupervised if the neck opening can catch on objects.

Back length: where to start and stop

Back length is measured from the base of the neck—where the neck meets the shoulders at the withers—to the base of the tail. Have your dog stand squarely to get an accurate straight-line measurement. Do not include the tail or the neck’s top; the withers to tail-base distance is what determines garment coverage.

Record back length in inches and compare it to the product’s listed body length. Crop-style pieces like the Raw Edge Dog Crop Sweatshirt and Eyelet Dog Crop Top intentionally have shorter lengths; measure how much coverage you want before purchasing. For cold-weather coats you may prefer back length that reaches the tail base; for layered tops you might opt for a slightly shorter length that stops before the hips.

If your dog has a tucked-up belly or a swayback, measure along the top line of the spine rather than trying to follow the curve—most garments assume a straight back length. For breeds with long torsos (Dachshunds, Corgis) add a little extra length to accommodate their proportions and prevent the garment from riding up.

Fitting specific garment styles and fabrics

Stretchy cotton-blend tops such as the Basic Dog Turtleneck Shirt offer forgiving fits—prioritize chest and neck for these because length is often more flexible. For very stretchy fabrics, a snug chest measurement that still allows two fingers of space usually works. Read fabric content and allow for 1–3 cm differences in finished measurements when listed.

Structured or three-layer sweatshirt fabrics like the Raw Edge Dog Crop Sweatshirt have less give. When sizing such garments, add 1–2 inches to chest measurements to ensure comfort, especially if layering over another top. Cropped silhouettes like the Eyelet Dog Crop Top require you to decide whether you want belly coverage; double-check back length so the crop lands where you expect on your dog.

If a garment includes features like rolled sleeves, thick hems, or bows, consider whether those details will add pressure points at the shoulders or hips. For dogs with mobility or joint concerns, avoid tight sleeve openings and watch for restricted stride caused by overly snug chest or shoulder fits. Always supervise the first few wears to ensure free movement.

Common measurement mistakes and quick checks

Mistakes often come from measuring a sitting or crouched dog, using a hard ruler, or measuring over heavy fur without flattening it. Avoid measuring when the dog is excited—wait until they stand naturally. If you use a string, lay it flat and measure the string with a ruler afterward to prevent errors.

A quick fit check after receiving a garment: slide two fingers under the chest and neck openings to confirm comfort, observe the dog walking and sitting for any pulling or rubbing, and check that the garment doesn’t cover the tail base unless intended. For turtlenecks and high collars, make sure your dog can pant and drink without restriction. If anything seems to impede movement or comfort, remove the item and re-measure.