How to choose the right headcollar size for your dog
The right headcollar fit should feel secure, comfortable, and easy to move in. Here’s what to look for before you choose a size.
A headcollar works best when it feels right. Not too loose, not too tight, and not like something your dog is fighting through the entire walk. The right fit should feel secure enough to guide, but light enough to settle into naturally.
If you’re still figuring out whether a headcollar is the right tool to begin with, start with How does a headcollar gently prevent pulling?. If you’re ready to browse styles, you can head straight to Headcollars.
Start with your dog, not the label
Breed can be a helpful reference point, but it never tells the full story. Two dogs of the same breed can still carry their size very differently, especially through the head, neck, and overall build.
That’s why fit should start with your dog’s actual proportions. Some dogs are broader and blockier, some are narrower and more athletic, and some sit somewhere in between. Those details usually matter more than the breed name alone.
Use the chart as your starting point, then choose based on your dog’s actual build, proportions, and how the fit looks once they settle into the gear.
A quick note on Doberman puppies
If you’re sizing for a Doberman puppy, Size M is usually the best place to start. It tends to be the right fit at the puppy stage, while still feeling secure and easy to wear.
That said, Dobermans grow fast. If your puppy is expected to grow beyond 70 lbs, Size L will usually make more sense in the long run. If they’re on track to become a real powerhouse over 100 lbs, moving up to XL may give them the extra room and comfort they’ll need later on.
In other words, Size M is often the right starting point, but long-term fit matters too.
What a good fit should feel like
A good fit should look natural and feel calm. It should stay in place without looking bulky, sloppy, or overly snug. Your dog should still be able to move, look around, and settle into the walk without the gear feeling like the whole event.
That’s really the standard: support, not pressure.
When it’s too loose
Usually, a loose fit is easier to spot than people think. It shifts around too much, feels inconsistent once your dog starts moving, or needs constant readjustment during the walk. If you keep fixing it, that usually means the fit is not quite there yet.
When it’s too tight
A fit that is too tight tends to feel tense right away. Your dog may seem overly aware of it, the setup may look too snug, and the overall walk can start to feel less natural than it should. A good headcollar should feel secure, but it should never feel heavy-handed.
For big dogs, small fit issues feel bigger
That’s especially true for larger dogs. A small mismatch in fit can feel much more obvious once momentum shows up on the walk, and when you live with a strong dog, that difference matters.
That’s why sizing matters so much. You’re not just choosing something that technically fits. You’re choosing something your dog can actually move in, settle in, and walk in comfortably.
Don’t rush the first impression
If your dog is new to a headcollar, the first minute does not tell you everything. New gear always feels new, and unfamiliarity can sometimes look like a fit issue when it really is just part of the adjustment.
Start slowly, try it indoors first, and keep the first session short. Once your dog settles, you’ll get a much clearer sense of whether the fit actually feels right.
Think about the full setup
A headcollar does not live on its own. It becomes part of the full walk, which is why it helps to think about the rest of your setup too. If you want a more complete everyday system, it can make sense to pair it with gear that follows the same comfort-first logic.
You can explore the DAY-LIGHT Collection, the DAY-LIGHT Dog Harness Ash Rose, or the Midnight Walker Dog Harness Silvermoon if you’re building a calmer, more supportive setup overall.
The bottom line
The right headcollar size should feel steady, comfortable, and easy to move in. Not distracting, not restrictive, and not overcomplicated. If it looks natural on your dog and feels calmer once they settle, you’re probably close.
Better fit, better walk.
Recommended next step
If you’re still deciding whether a headcollar is the right tool for your dog, read How does a headcollar gently prevent pulling?.
Recommended products
Headcollars Collection
DAY-LIGHT Collection
DAY-LIGHT Dog Harness Ash Rose
Midnight Walker Dog Harness Silvermoon