· Dana Whitfield
Dog collar size chart: how to get it right the first time
Nearly every collar returned for fit was ordered from a breed chart rather than a tape measure. Breed tells you very little. Two Labradors of the same age can be two inches apart at the neck, and a heavy-coated dog measures wider in winter than the same dog in July.
The chart
These ranges are the manufacturer's own table converted to inches and rounded inward at every boundary. That matters: it means a dog sitting at the top of a range is genuinely at the limit rather than comfortably inside it.
| Size | Neck | Strap width | Typical dog |
|---|---|---|---|
| XS | 7 – 10.5 in | 0.6 in | Chihuahua, Yorkshire Terrier, small puppy |
| S | 9 – 12.5 in | 0.6 in | Miniature Dachshund, Shih Tzu, Papillon |
| M | 11 – 14.5 in | 0.8 in | Beagle, Cocker Spaniel, French Bulldog |
| L | 13.5 – 17.5 in | 1 in | Border Collie, Australian Shepherd, Boxer |
| XL | 17 – 21.5 in | 1.2 in | German Shepherd, Labrador, Golden Retriever |
The breed column is a starting point, not an answer. Measure the dog you have.
How to measure, in one minute
Use a soft tailor's tape. If you do not own one, a strip of string and a ruler works just as well.
- Have your dog stand rather than sit. A sitting dog folds his neck and reads short.
- Run the tape around the base of the neck, where the collar naturally settles, not up under the jaw.
- Slide two fingers flat between the tape and the coat, and keep them there while you read.
- Read the number in inches at the point where the tape meets.
The two fingers are the whole trick. They are what turns a measurement of the neck into a measurement of the collar, and they are why a tape pulled snug gives you a collar that will not fit.
What to do when your dog lands between two sizes
Take the larger one. This is not a hedge. A collar sits in a range because the buckle has several holes, and the useful part of that range is above the number you measured, not below it. A dog at 14.5 inches in a size that stops at 14.5 has exactly one hole that works, and no room for a thicker winter coat or a few extra pounds.
There is one exception. If your dog is at the very bottom of the larger size and fully grown, the smaller size will hold the plate flatter against the neck. A collar that rotates puts the engraving face down in the fur, which defeats the point of having it.
Puppies are a different problem
A puppy under a year will usually outgrow his first collar within a few months, and there is no way to buy around it. Buying large and cinching it to the last hole produces a loose band that rotates, slides forward toward the ears and comes off over the head at the worst possible moment.
Buy the size that fits today, check the fit every two weeks with the same two fingers, and expect to buy once more before the first birthday. For most medium breeds that means an S or M at twelve weeks and an L by ten months.
Strap width is part of the fit
Width is the column most charts leave out, and it changes how the collar behaves. A 0.6 inch strap on a small dog distributes pressure adequately and stays light. The same 0.6 inch strap on a shepherd cuts a narrow line into the coat and puts all the pull on a thin band. Our sizes step up in width along with neck length for that reason: 0.6 inch through S, 0.8 at M, 1 inch at L and 1.2 at XL.
If your dog pulls hard on the lead, the wider strap in the larger size is doing real work. It is also the reason a collar bought two sizes up "so it lasts" is a worse collar and not just a looser one.
When to re-measure
Three moments are worth a check: at the change of season on a double-coated breed, after any significant weight change, and any time you can slide more than two fingers under the strap without effort. A collar that has quietly loosened is the one a dog backs out of on a walk.
What a size chart cannot tell you
Two things fall outside any table. The first is head shape. On a sighthound, a whippet or an Italian greyhound, the skull is barely wider than the neck, so a collar fitted by the two-finger rule can still slide off over the ears when the dog reverses. Those breeds need either a snugger fit checked far more often, or a collar shaped to widen at the throat.
The second is coat density. A double-coated dog measured in February and the same dog measured in July can be three quarters of an inch apart, and the tape does not know which one you are holding. Push the tape gently down to the skin on a thick coat and note both numbers, because the winter figure is the one that decides whether the last hole is enough.
Measuring a dog that will not stand still
Most fit problems trace back to a bad measurement rather than a bad chart. If your dog treats the tape as a game, take the measurement while he is eating, or measure a collar that already fits and read it flat on the table instead: lay it out, measure from the buckle pin to the hole currently in use, and you have the number without touching the dog at all. That figure is directly comparable to the neck column above.
Dana Whitfield · Curator, Namouf
Dana chooses what goes in the catalog and writes the sizing guidance. When two sources disagree about a measurement, she is the one who decides which number gets published.