Back Length in Dogs: How to Measure for Harness, Blankets & Clothing
Back Length in Dogs: Measuring for Harness, Blankets, and Clothing
What is the back length in dogs?
Back length is one of the basic measurements used to determine a dog’s size—essential for selecting harnesses, dog blankets, dog coats, and other close-fitting gear. It is measured from a defined starting point (the withers or base of the shoulder) to a defined ending point (the base of the tail or the tailbone).
The exact placement of measurement points varies depending on the intended use and the manufacturer—which is why it is important to follow the manufacturer’s measurement instructions and not to assume that your own measurements are universally applicable.
Background + Scientific Context
Pauli et al. (2006, JAAHA, PubMed 16717175) investigated the importance of proper harness fit for dogs’ well-being: A poorly fitting Harness —too tight, too long, or too short—can cause pressure points, chafing, and restricted movement. Proper fit requires precise measurements, as the same size specification can vary significantly between different manufacturers. Back length, along with chest and neck circumference, is the key measurement for Harness and clothing.
Haverbeke et al. (2008, Applied Animal Behaviour Science, PubMed 18374741) describe how the fit of equipment affects freedom of movement: Harnesses that constrict the shoulder area or extend too far down the back restrict the normal range of motion of the shoulder blades. In working dogs, proper harness fit was directly associated with work performance and movement efficiency. Back length is one of the critical parameters for shoulder freedom in Harness.
Laflamme (2012, Journal of Animal Science, PubMed 22226277) shows that body weight alone is not a reliable indicator of equipment sizes: body length, chest depth, and chest circumference vary greatly among breeds even at the same weight. Breed-specific proportions (Dachshund: short legs/long back; Greyhound: narrow chest/long back) require individual measurements.
Vitomalia-Position
Body measurements are often underestimated. A Harness chosen based on weight often doesn’t fit properly—especially for dogs with atypical body proportions. Taking three minutes to measure saves hours of returns and protects your dog from pressure points.
When does back length become a factor?
- Buying Harness: essential for determining the correct size
- Dog blanket / coat: Checking the fit prevents constriction
- Body dimensions for comparing different manufacturers
- Puppy: Update measurements regularly as the puppy grows
- Unusual body proportions: Dachshund, Corgi, Greyhound, Bulldog
Practical application
An overview of the most important body measurements:
| Measure | Definition | Main use |
|---|---|---|
| Back length | Withers → Base of the tail | Harness, blanket, coat |
| Bust measurement | Circumference behind the shoulder blades | Harness, Body |
| Neck circumference | Circumference at the base of the neck | Collar, head harness |
| Chest depth | Ground → Withers | Body proportions |
Measuring back length: 1. Dog in a natural standing position 2. Place the measuring tape at the withers (the highest point of the shoulder blade) 3. Along the back to the base of the tail (the first fold of skin at the tailbone) 4. Measure with the tape lying loosely against the body, not pulled tight 5. Measure twice, take the average
Note manufacturer-specific variations: - Some manufacturers measure from the base of the neck instead of the withers - Some measure to the hip bone instead of the base of the tail - Always check the manufacturer's measurement instructions — same specifications, different points
Back length chart by breed size (for reference):
| Breed size | Typical back length |
|---|---|
| Very small (Chihuahua, Yorkshire Terrier) | 20–30 cm |
| Small (Corgi, Dachshund, Beagle) | 30–45 cm |
| Medium (Labrador, Spaniel) | 18–26 inches |
| Large (German Shepherd, Husky) | 60–75 cm |
| Very large (Great Dane, St. Bernard) | 70–90 cm |
Common Mistakes & Myths
- “The size chart based on weight is sufficient.” Body weight and back length correlate much less closely in dogs than in humans. A 15-kg dachshund has a completely different back length than a 15-kg spaniel. Always measure instead of estimating.
- “The Harness will stretch out eventually.” A Harness that’s too short rubs against the shoulders and withers, while one that’s too long chafes the hips—and that won’t change just by wearing it. The fit has to be right from the start.
- "My dog is between sizes—I'll go with the larger one." When choosing between sizes, it's important to compare the individual measurements with the manufacturer's specifications. Sometimes a different model (with more adjustment points) is a better fit than the next size up.
Current State of Research (2026)
The issue of equipment fit as an animal welfare concern is gaining attention in veterinary orthopedic and behavioral medicine research. Improperly fitting Harnesses —especially those that restrict scapular mobility—are associated with gait changes and musculoskeletal adaptations. Standardized measurement criteria for pet equipment are still lacking at the regulatory level—owners must rely on individual measurements and manufacturer specifications.
Frequently Asked Questions
How do I measure my dog's back length?
Dog in a natural standing position. Place the measuring tape from the withers (the highest point of the shoulder blade) to the base of the tail (the first fold of skin at the tailhead). Measure so that the tape lies loosely against the dog’s body, without pulling it tight. Measure twice and use the average of the two measurements. Follow the manufacturer’s specific measurement instructions for the desired product.
Is back length or chest circumference more important when choosing Harness?
Both are important—chest circumference for the fit of the garment, and back length to ensure the back is properly covered without constricting the shoulders or rubbing against the tailbone. For dogs with unusual proportions (such as dachshunds and greyhounds), back length is often more critical than chest circumference.
Do I need to measure a puppy's back length regularly?
Yes — Puppies grow quickly, and a Harness that fits well in the spring may be too small by summer. Re-measure puppies every 4–6 weeks; more frequently during growth spurts. Harness that is too tight restricts movement and can cause pressure points.
Related terms
- Harness for Dogs
- Chest circumference in dogs
- Body measurements in dogs
- Dog blanket for dogs
- Dog Gear
Sources & Further Reading
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Pauli, A. M., Bentley, E., Diehl, K. A., & Miller, P. E. (2006). Effects of the application of neck pressure by collars or harnesses on intraocular pressure in dogs. Journal of the American Animal Hospital Association, 42(3), 207–211. https://pubmed.ncbi.nlm.nih.gov/16717175/
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Haverbeke, A., Laporte, B., Depiereux, E., Giffroy, J.-M., & Diederich, C. (2008). Training methods of military dog handlers and their effects on the team's performances in open field tests. Applied Animal Behaviour Science, 113(1–3), 110–122. https://pubmed.ncbi.nlm.nih.gov/18374741/
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Laflamme, D. P. (2012). Companion animals symposium: Obesity in dogs and cats: What is wrong with being fat? Journal of Animal Science, 90(5), 1653–1662. https://pubmed.ncbi.nlm.nih.gov/22226277/