Best E Collar for Large Dogs: Sizing Guide 2026

By INVIROX Training Team · Published 2026-09-13 · 8 min read

Measure, do not estimate

Breed name is a bad proxy for neck size. Two German Shepherds of the same weight can differ by three inches at the neck, and giant breeds vary more than that. The measurement takes a minute and it prevents almost every sizing return.

1. Use a soft tape, not a rigid one. A shoelace and a ruler works if you have neither.
2. Measure high on the neck, just under the jaw, which is where the receiver sits. Do not measure at the base of the neck, which is where a flat collar sits and is a bigger number.
3. Measure through the coat as it is now, and note whether that coat gets substantially thicker in winter.
4. Add one finger of room for a receiver. One, not two. Two fingers is the flat-collar standard and it is too loose for a contact device.
5. Compare against the strap's full stated range and make sure your figure sits comfortably inside it, not at the last hole.

A collar buckled at its final hole has nowhere to go if the dog gains weight or grows a winter coat, and a collar at its first hole usually means you have bought two sizes too big and the excess strap will flap.

→ Related reading: the full fitting guide

Typical ranges by build

These are starting points for what to expect, not substitutes for measuring.

The double-coated row is the one that catches people. The neck itself may measure 20 inches, but the coat adds depth that the contact points have to get through, and that is a separate problem from strap length.

A strap range of roughly 9 to 29 inches covers essentially every dog on that table, which is why an adjustable strap with closely spaced holes is worth more than a size chart. Closely spaced holes matter because the difference between correct and too loose on a big dog can be half an inch.

Coat depth is a second measurement

Strap length gets the collar around the neck. Contact point length gets the signal to the skin. They are independent, and confusing them is the most common large-dog mistake in the category.

Part the coat where the receiver will sit and look at how far the skin is from the surface. On a short-coated dog it is immediate. On a Husky or a Bernese it can be well over a centimetre of dense undercoat, and no standard prong reaches through that.

The seasonal note matters for anything double coated. A system that worked perfectly in July can stop registering in January purely because the undercoat came in, and the fix is longer prongs rather than a higher level.

→ Related reading: getting contact through a heavy coat

Receiver weight and where it sits

Receiver weight is rarely the limiting factor on a large dog, which is a genuine advantage of size. A unit that would be noticeable on a 12lb dog is irrelevant on a 90lb one.

What does matter is position stability. A heavier unit on a long strap has more leverage to rotate, and a rotated receiver is a receiver making no contact. That is why the one-finger rule matters more on big dogs than on small ones, not less.

• Sit the receiver high, just under the jaw, where the neck is narrowest and most stable.
• Check position after the dog has been moving for a minute, not just when they are standing still.
• If the unit consistently ends up under the chin, the strap is too loose or sitting too low.
• For dogs that wrestle or swim, check position more often. Both rotate a collar quickly.

Strap type: standard, TPU or bungee

For large dogs the strap choice makes a real difference, and there are three sensible options.

A standard biothane or TPU strap is the default. It is easy to clean, does not absorb water, and with closely spaced holes it fits most necks precisely. A wide range of roughly 9 to 29 inches with 52 holes covers every large breed and can be cut to length so there is no flapping tail of excess strap.

A bungee strap is the answer for heavy coats. The elastic section keeps steady pressure as the dog moves and breathes, rather than alternating between correct when still and loose when active, which is exactly what a rigid strap does through dense fur. The trade is that the usable length feels shorter than the stated figure, which surprises people with giant breeds.

Whichever you pick, treat it as a consumable. A strap that has stiffened or stretched will not hold a snug fit however you buckle it, and it produces the same intermittent behaviour as a dead battery.

→ Related reading: choosing between strap types

Weight ranges on the box, and what they mean

Systems state a weight range, commonly something like 30 to 150lb. That figure is about the receiver being proportionate rather than about signal strength, which is a distinction worth understanding.

A dog below the stated minimum is usually being told the receiver is physically too large for comfortable wear, not that the system would be too strong. A dog above the stated maximum is usually being told the strap may not close, not that the system is too weak.

Sensitivity is individual and has very little to do with body mass. Plenty of 100lb dogs work at the bottom of the level scale. Choosing a system because it is rated for heavier dogs, in the belief that means more output, is choosing on the wrong axis entirely.

→ Related reading: why size does not predict sensitivity

Growing dogs and older dogs

Fit is not a one-time decision on a large breed, because the neck you measured is not the neck you will have in six months.

• Through the first year, check tension weekly. A strap set correctly in spring can be genuinely restrictive by late summer on a fast-growing giant breed.
• Expect to move up a contact point length when the adult coat comes in on a double-coated dog.
• After the first moult, re-check. Some dogs need shorter points in summer and longer ones in winter.
• In older dogs, muscle over the neck reduces and the fit that has been right for years quietly stops being right.
• If a settled adult starts ignoring a system they have respected for a long time, check fit before concluding anything about behaviour.

That last point saves a great deal of frustration. Owners tend to interpret a sudden change as the dog testing boundaries, when the far more common explanation is a strap that has stretched or a coat that has thickened.

A five-minute fit check

Run this on the first day, at the end of the first week, and then monthly.

1. Stand the dog up normally rather than sitting.
2. Confirm the receiver is high on the neck, just under the jaw.
3. Slide one finger under the strap. It should fit with a little resistance and a second finger should not.
4. Lift the strap and part the coat around both contact points. You should see skin, not fur.
5. Let the dog move around for a minute, then check position again. If it has rotated, tighten one hole.
6. Use the tester bulb across the points if your kit includes one. A lit bulb means the receiver is delivering and any remaining problem is training rather than hardware.

What you are not looking for is a mark on the skin. A correctly fitted receiver, taken off overnight and rotated during long days, leaves nothing behind.