Glossary

Harness vs collar

A flat collar holds ID tags, while a harness spreads a leash's pull across a dog's chest and shoulders instead of the neck.

Also called: dog harness, dog collar, front-clip harness, back-clip harness, no-pull harness, flat collar, head halter

A flat collar is a band around the neck that holds a license tag and ID, and many owners clip a leash to it. A harness is a set of straps that goes around the chest and shoulders. When a dog pulls, a harness spreads the force across the body instead of the throat, which suits small dogs with delicate necks, dogs prone to neck or breathing problems and dogs that pull.

Harnesses come in two main clipping styles. A back-clip harness attaches on top of the back and is comfortable, while a front-clip harness attaches at the chest and can turn a pulling dog to the side. Fit matters, so it should not rub under the front legs.

Many people use both: a collar for tags and a harness for walks. Dogs with narrow heads, such as a dolichocephalic breed, may need a martingale collar or a harness to avoid slipping out.

Last reviewed November 8, 2026

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Related terms

Martingale collar A two-loop collar that tightens a limited amount when a dog pulls, so it cannot slip over a narrow head but does not choke when sized correctly. GPS dog tracker A collar-mounted device that uses satellite positioning and a cellular connection to show your dog's location on a phone, usually for a monthly fee. Dog car seat and restraint A booster seat, harness or secured crate that holds a dog in place in a vehicle, protecting both the dog and the people from injury in a sudden stop or crash. Dolichocephalic Having a long, narrow skull and a long muzzle, as in the Greyhound, Collie, Borzoi and Saluki.