Snazzy Pooch Size Guide

Dog Harness & Collar Size Guide – Find the Perfect Fit

Whether you’re shopping for a personalised dog harness or a faux leather collar, getting the right size is key for comfort and safety. Our breed-specific UK size guide helps you find the best fit based on weight, neck and chest measurements — with breed tips and an option for Other (Not Listed). Use it for popular breeds such as Cavapoo, Cockapoo, Dachshund, French Bulldog, Labrador, Shih Tzu, Golden Retriever, Chihuahua, Pug, Border Collie, Cocker Spaniel, Staffy (Staffordshire Bull Terrier), German Shepherd, Beagle, Boxer and Jack Russell.

How to Measure Your Dog

  • Neck: Measure around the base of the neck where a collar sits. Keep two fingers under the tape for comfort.
  • Chest (girth): Measure the widest part of the chest behind the front legs. This determines harness size.
  • Weight: Use accurate scales. Weight guides No-Pull / Step-In sizing.

Which Product Are You Buying?

Personalised Harnesses: Sized by neck & chest (cm).
No-Pull & Comfort Harnesses: Sized mostly by weight (kg), confirmed by chest fit.
Step-In Harnesses: Sized by weight & chest width.
Faux Leather Collars: Sized by neck (cm).
Personalised Collars: Sized by neck (cm).

Still Not Sure? Try Our Interactive Tool

Use the widget below to get instant recommendations based on your dog’s breed, neck, chest and weight. If in doubt, always size up for comfort.

Find the Perfect Fit

⚠️ Please note: All measurements are a guide based on UK breed averages. If you’re unsure, always measure your dog. Sizes may vary by 1–3 cm. If between two sizes, we recommend sizing up for comfort.

Breed-Specific Size Tips (UK favourites)

Labrador: Broad chest and powerful shoulders; many Labs keep filling out until 18–24 months. If training a puller, a front-clip no-pull harness improves control. Check chest room over winter coats.

Staffordshire Bull Terrier: Muscular neck and deep chest. Choose sturdy, padded harnesses and avoid rubbing under the forelegs. If between sizes on chest, go up.

French Bulldog: Stocky frame with short neck. Avoid pressure on the throat; a Comfort Fit harness spreads load across the chest. Watch chest width carefully.

Dachshund: Long backs and narrower fronts. Step-In harnesses help keep pressure off the spine. Ensure the chest strap sits lower and does not rub the underarm.

Cockapoo & Cavapoo: Fluff can hide fit. Re-measure after grooming. Adjustable Step-In or No-Pull harnesses suit energetic walks.

Golden Retriever: Feathered coats need adjustability. No-Pull or Comfort Fit works well for adolescence when pulling is common.

Beagle: Active scent hounds; choose secure Step-In or Comfort Fit. Measure snug to prevent backing out when following a scent.

Jack Russell: High-energy and surprisingly strong. A snug Step-In or No-Pull harness helps control zig-zagging. Double-check chest fit.

Shih Tzu & Chihuahua: Small frames; light hardware and soft webbing are key. Avoid bulky fittings near joints.

Border Collie & German Shepherd: Athletic, working builds. Front-clip options assist with heel training. Coats change seasonally — re-check fit every few months.

Popular UK Size Queries We Answer

  • Best harness size for Cavapoo by chest & weight
  • Which collar size fits a French Bulldog neck?
  • No-pull harness size for Labrador puppy (kg to size)
  • What size Step-In harness for a Dachshund chest?
  • Comfort harness size for Shih Tzu with long coat
  • Border Collie harness fit guide: training & front-clip
  • Staffy (Staffordshire Bull Terrier) chest size & harness type
  • Exact collar size for a Jack Russell 30–33 cm neck

When to Size Up or Down

If your measurement sits at the very end of a range, we suggest sizing up for harnesses and choosing the smaller band for collars where possible (so you’re not on the last hole). Always check chest room for deep-chested or stocky breeds.

Troubleshooting Fit

Rubbing near the forelegs? Lower the chest strap or try a Step-In. Collar rotating or slipping? Go down one band or try a personalised collar with a narrower strap. Pulling on walks? A front-clip No-Pull harness can help with heel training.

Dog Size Guide FAQs (UK)

How do I measure my dog for a harness?

Measure the neck where a collar sits and the widest part of the chest behind the front legs. Keep the tape snug but not tight.

What size collar does my dog need?

Match your dog’s neck measurement to our collar size ranges. If between sizes, choose the larger for comfort.

Do dogs in the UK need engraved collars by law?

Yes. The Control of Dogs Order 1992 requires a collar & ID tag with the owner’s name and address when in a public place.

Which harness style is best for my breed?

Active pullers often benefit from a front-clip no-pull harness. Smaller breeds may prefer step-in styles. Use the tool above for a tailored suggestion.