How to Properly Fit a Heavy-Duty Dog Collar: Step-by-Step

Quick Answer

Measure your dog's neck snugly with a soft tape, add about two finger-widths of slack, then adjust the collar so it sits high on the neck and cannot slip over the head. For heavy-duty collars, make small link or buckle adjustments and recheck the fit after every change.

A heavy-duty collar only works as well as its fit. Too loose, and your dog can back out of it; too tight, and it can rub or restrict breathing. The good news is that fitting a heavy-duty collar is a repeatable process you can do in a few minutes at home.

This guide walks through measuring your dog's neck, choosing the right adjustment method for your collar style, and checking the fit before every walk. It also covers what to do when your dog is between sizes or when a collar uses removable links instead of a traditional buckle.

Measure Your Dog's Neck Correctly

Use a soft measuring tape or a piece of string you can mark and measure later. Wrap it around the middle of your dog's neck, right behind the ears and above the shoulders, where a collar naturally sits. Keep the tape snug against the fur but not tight enough to indent the skin.

Write down the measurement in inches or centimeters and add roughly two finger-widths of slack. For most dogs, that is about 1 to 1.5 inches of extra room. If your dog has a thick coat, measure over the fur rather than pushing it down, since the collar will sit on top of the coat anyway.

• Measure at the same spot each time so your size stays consistent.
• If your dog is wiggly, measure twice and average the numbers.

Match the Collar Style to Your Adjustment Method

Heavy-duty collars generally adjust in one of two ways: through a traditional buckle with holes, or through removable links that change the collar's total length. Buckle collars are quick to resize but limited to the holes punched in the strap. Link collars, like the Herm Sprenger NeckTech line, let you fine-tune the fit by adding or removing individual links.

If your dog falls between sizes on a buckle collar, a link-based collar often gives a closer fit because each link changes the length in smaller increments. That matters for dogs with thick necks or unusual proportions, where a single hole can be the difference between comfortable and too loose.

• Check whether your collar uses holes, links, or both before you start adjusting.
• Keep spare links or a spare strap in a safe place once you find the right fit.

Adjust the Collar in Small Steps

Make one adjustment at a time, then put the collar back on your dog and check the fit. You should be able to slide two fingers flat between the collar and your dog's neck without forcing them. If you can fit more than two fingers easily, the collar is too loose; if you cannot fit two, it is too tight.

After adjusting, watch how the collar sits when your dog moves. It should stay high on the neck, just behind the ears, and not slide down toward the shoulders. If it drops, tighten by one hole or add a link, then recheck. Repeat until the collar stays in place during a short walk or a few minutes of play.

• Do not adjust more than one step at a time; small changes are easier to judge.
• Recheck the fit after your dog eats, drinks, or gets wet, since fur and skin can change slightly.

Check the Fit Before Every Walk

A good fit can change over time. Weight gain or loss, a thick winter coat, or a summer haircut can all affect how a collar sits. Before each walk, slide two fingers under the collar and confirm it still feels snug but not tight. Look for any rubbing, hair loss, or redness around the neck, which can signal that the collar is too tight or sitting too low.

If you use a heavy-duty collar for training or with a leash, attach the leash and gently test the collar's position. It should not rotate freely or slip over the head when your dog pulls backward. If it does, you need a smaller size or one more link removed.

• Keep a note of your dog's current collar size so you can quickly check replacements.
• If you see persistent rubbing, try a different collar style or add a soft cover.

Step-by-Step Collar Fitting Checklist

1. Measure the neck: Wrap a soft tape behind the ears and above the shoulders, keeping it snug but not tight. Write down the number. Checkpoint: You should be able to slide two fingers under the tape.
2. Add two finger-widths of slack: Add about 1 to 1.5 inches to your measurement, or roughly two finger-widths, to get your target collar size. Common mistake: Measuring too low on the neck, which gives an inaccurate size.
3. Adjust the collar in small steps: Change one hole or add/remove one link at a time, then recheck the fit on your dog. Checkpoint: The collar should stay high on the neck and not slip over the head.
4. Test the fit during movement: Walk your dog or play for a few minutes, then check whether the collar has shifted or loosened. If it moves, tighten by one step and retest.
5. Recheck before every walk: Slide two fingers under the collar and look for rubbing or redness around the neck. Adjust as seasons, weight, or coat changes affect the fit.

Product Facts That Help With Fitting

• Herm Sprenger NeckTech Fun Extra Stainless Steel Links (2): Each extra link adds 1.25 inches (3 cm) to the total length of the collar, and links are sold in packs of 2. If your dog's NeckTech collar is slightly too short, adding one or two links lets you fine-tune the length without buying a whole new collar.
• Herm Sprenger NeckTech Sport Extra Stainless Links (2): These stainless steel links are designed to customize NeckTech Sport collars by adding or removing links for a perfect fit. Stainless steel resists rust and corrosion, so you can adjust the fit season after season without worrying about the links degrading.
• 2.25mm Black Stainless Herm Sprenger Ultra-Plus Prong Training Dog Collar Replacement Links: These links add length to Herm Sprenger Ultra-Plus Prong Training Dog Collars and attach easily to existing links. If you use a prong collar for training, replacement links let you adjust the fit as your dog's neck size changes or as you add or remove links for comfort.
• Peanut Durable and Tough Nylon Chew Toy: This durable nylon chew toy can be filled with treats like peanut butter for extra stimulation. A durable chew toy gives your dog a safe outlet for chewing, which can reduce pulling and mouthing during collar fitting and walks.

Fitting a heavy-duty dog collar is a simple routine: measure, adjust in small steps, and recheck before each walk. With the right fit, your dog stays comfortable and secure, and you can focus on the walk instead of the collar.