In short
- A collar carries the ID tag and a harness spreads the pull across the chest, so many owners use a collar for identification and a harness for walking.
- Size your dog by measuring with a soft tape and the maker's chart, not by guessing from breed or a letter size.
- A good fit is snug but not tight, does not rub, and cannot be slipped out of.
- Extending leashes need extra care: the cord can burn skin and a dog can reach the end suddenly.
- Check clips, stitching and tags before walks, and ask a vet or trainer if your dog pulls hard, coughs on the leash or is fearful outside.
Walking gear looks simple until you face dozens of options. A few questions settle most of the choice: how your dog moves, what shape your dog is, and where you walk. This guide covers collars, harnesses and leashes in plain words, shows how to measure, and ends with ID tags and a check to do before each walk.
Collar or harness?
A flat collar sits around the neck. It is the natural place for an ID tag, and for a calm dog that walks nicely it can be all you need. The drawback is that any pull on the leash lands on the neck. A harness is a set of straps around the chest and shoulders, so the pull is spread over more of the body. Many owners use both: a collar that stays on for the tag, and a harness for walks.
Which one suits your dog depends on the dog. A harness is often chosen for small dogs, for dogs that pull, and for dogs with a narrow head that can slip out of a collar. A collar may be more comfortable for a dog that dislikes straps over its body. Neither teaches a dog to walk politely on its own; that takes practice. If your dog coughs or gags when the leash tightens, or has any neck, back or breathing problem, ask a vet which type is suitable before you choose.
Harness and collar styles in plain words
| Style | How it works | Things to consider |
|---|---|---|
| Back-clip harness | The leash attaches between the shoulder blades | Simple and comfortable for many dogs; a dog that pulls may still pull |
| Front-clip harness | The leash attaches at the chest | Some owners find it helps with dogs that pull, because a pull turns the dog sideways; a slack leash can tangle around the front legs |
| Vest harness | Wide panels cover the chest and back | More surface touching the dog, so check for rubbing and for warmth in hot weather |
| Flat collar | A buckle or quick-release clasp | The usual everyday choice and the place for the tag |
| Martingale collar | A loop tightens by a limited amount when the dog pulls | Sometimes used for dogs whose heads are narrower than their necks |
Labels such as "no-pull" or "no-choke" describe how a harness is meant to work. Fit and training make the difference, so judge a harness by how your dog actually moves in it. Chain slip collars and other training collars tighten when the dog pulls and can hurt a dog if they are used wrongly, so do not use one until a qualified trainer has shown you how.
Measuring for a good fit
Sizes such as small, medium and large differ from one maker to the next, and breed is a poor guide because dogs of the same breed vary a lot. Measure your own dog with a soft tape, the kind used for sewing, while the dog stands. Then compare the numbers with the size chart on each product page.
- Collar: measure around the neck where the collar will rest, and check the size range given for the collar.
- Harness: most charts ask for the chest, measured around the widest part of the ribcage just behind the front legs. Some also ask for the neck or the length of the body.
- Between sizes? Look at how much adjustment the harness has, or ask through the contact page.
- Puppies and thick coats: a growing puppy can outgrow gear quickly, so recheck often. With a fluffy coat, measure over the coat as it normally lies.
Once the gear is on, check the fit. A common rule of thumb for a collar is that you can slide two fingers flat under it; for very small dogs, ask a vet or trainer how snug is right. A harness should sit snugly without pinching behind the front legs, should not press on the throat, and should not twist when the dog moves. Your dog should be able to walk, sit, lie down and turn comfortably, and should not be able to back out when the leash is gently tightened. After a walk, look at the fur and skin under the straps for rubbing, and adjust or change style if you find any. If you plan to put a harness on over a coat, our guide to dressing a dog for cold and wet weather explains what to check.
Choosing a leash
A fixed-length leash is the simplest and most predictable type. A shorter one keeps a dog close in busy places, while a longer one gives more room to sniff. Flat nylon is light and easy to wipe clean, rope is soft in the hand, and leather feels comfortable once it is broken in. Pick a handle you can hold for a whole walk and a clip that closes firmly. A very long line is for practice in open spaces, never for crowded areas, and gloves protect your hands if a dog runs out to the end of it.
Extending leashes need extra care
An extending (retractable) leash has a thin cord that reels in and out of a handle. It can suit a quiet, open area, but the risks are real:
- The cord can burn or cut skin if it runs across your hand or leg, or around your dog's leg. Never grab the cord itself.
- A dog can run to the end of the cord at speed, which is hard on the neck, and a dog far out on the cord is a long way from you if something happens.
- If you drop the handle, it can clatter after the dog and frighten it.
- Cords can fray and locking buttons can fail, so inspect them often.
Lock the leash short near roads, in busy places and around other dogs. Because an extending leash keeps a little tension on all the time, many people choose a fixed leash when teaching a dog to walk beside them.
ID tags and a check before each walk
An ID tag is the quickest way for a stranger to get a lost dog back to you. Put a phone number on it and keep it readable, because engraving wears down. Attach it with a closed ring, and keep a collar on a dog that walks in a harness so that the tag is always there. Rules about dog licenses differ from place to place, so check yours. Ask your vet about microchipping, and keep the details linked to the chip up to date.
Before each walk, take ten seconds to check that buckles and clips close fully, that webbing and stitching show no fraying or thin spots, that metal parts have no cracks or rust, that the fit has not changed, and that the tag is legible and its ring is closed. Replace anything worn. Gear does not replace training: if your dog pulls hard, lunges or is afraid outside, ask a qualified trainer or a vet for help.
When you are ready to choose, browse Harnesses, Collars, Leashes and Walking Accessories, or the whole of Harnesses, Collars & Leashes.