Adjustable Dog Collars vs. Fixed Size: Why Flexibility Matters for Your Dog's Comfort

Published in Oct 14, 2025 | Last updated: Jun 15, 2026

An adjustable dog collar is the better choice for most dogs because it accommodates the natural changes in your dog's neck size over time: seasonal coat thickness, weight fluctuation, and growth in younger dogs. A fixed-size collar can fit correctly on the day of purchase and be noticeably too tight or too loose within weeks. An adjustable leather collar with a traditional belt-hole buckle eliminates this problem permanently, providing a precise fit that can be corrected in seconds without replacing the collar.

Aeris Classic Dog Collar in Brown
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The Problems with Fixed-Size Collars

Too Tight, Too Loose: The Compromise Trap

When it's time to buy a new dog collar, it might seem more convenient to go for a fixed-size option, but we're here to let you know that they very rarely offer a precise fit. You will get two or three sizes that fall into general ranges, but that can leave a lot of dogs with collars that are either dangerously loose or slightly too tight.

There is a temptation to fall into the trap of 'oh it's a little snug, but he'll get used to it' or 'oh a little loose, but at least it's not going to choke him'. The truth is that neither of these scenarios is ideal. A dog collar should always fit just right, not close enough.

Take one of our customers Sarah, for example. Her beautiful husky slipped loose from their collar and made a dangerous dash into some traffic. Thankfully, she was able to act fast enough to catch them safely, but it proved to be a real wake up call to find something better than an old fixed size piece.

How Poor Fit Affects Behavior and Training

It doesn't take an animal expert to realize that lead discomfort can lead to things like irritability, refusal to walk and excessive pulling. Pups can also paw at their collars or act in an avoiding manner when they sense it's time to leash up. Don't make the mistake of thinking that these behaviors are just personality quirks, they are usually a sign that your pet is not comfortable.

The dogs that suffer the most from bad fixed sizing are short necked breeds like bulldogs and pugs, and long furred breeds like golden retrievers. The collar will either disappear under their fragile coat or press uncomfortably against their skin. Neither is a good thing!

Safety Risks of Improper Collar Fit

Some of the latest stats from animal welfare organizations have suggested that up to 15% of lost dogs are wearing ill fitting collars that they slip out of when travelling. That's such a large number considering the issue can be solved with a simple adjustable dog collar!

In addition to the obvious escape risk, there is also the problem of tight collars causing things like hair loss, skin irritation and even damage to the trachea if you own a smaller breed. The Animal Humane Society recommends checking collar fit monthly for adult dogs and weekly for puppies, confirming that a properly fitted collar, where two fingers slide in with light resistance, remains the most reliable protection against both escape and injury risk.

Vero Classic Dog Collar in Black
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The Benefits of Adjustable Design

Perfect Fit Every Time: How Adjustability Works

The best thing about an adjustable dog collar is that it can conform to the unique shape of your own pup, not the other way around. Rather than relying on a pre-sized collar to have the Goldilocks effect, why not just pick an accessory that you can fine tune for yourself?

Belt-Like Simplicity: Easy Adjustment for Everyone

Take a second to think about how you adjust your own belt in the morning, well that's exactly how our collars from The Lille Bjorn work! No breakable buckles, no complicated plastic sliders, just a classic and common sense designed with solid holes that are going to hold their strength and shape.

Tom, a recent customer, shared with us that his arthritic hands made it very difficult for him to use plastic clip collars. Making the switch to one of our belt style collars made prep for daily walks so much smoother, and much less stressful for both him and his beautiful labrador, Daisy!

Accommodating Growth and Seasonal Changes

As much as we'd all love our pets to stay puppies forever, the truth is that dogs grow fast! Fur also gets thicker and thinner depending on the seasons. Your dog can also gain and lose weight over time, and a fixed size collar just can't account for all of these changes.

On the other hand, an adjustable dog collar can be tightened and loosened as needed. Absolutely no need to keep buying a new collar every few months, all you need to do is move to the next sturdy hole. Whether your furry friend is still growing or their thick winter fluff is coming in, you can size up and down as you go.

Single-Piece Construction with Adjustable Comfort

If you were wondering whether adjustability affects breathability or durability, you don't have to worry at all.

Adjustable collars from The Lille Bjorn are made with a single piece of breathable leather, which means no synthetic backing, no glues layers and no weak points anywhere. This kind of premium construction offers maximum flexibility and resilience, and your pup can stay cool and comfortable even on the longest walks and warmest days.

Aeris Classic Dog Collar in Blue
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Health and Comfort Benefits

Proper Fit for Optimal Breathing and Circulation

The main problem with tight collars is that they can compress a pup's windpipe, especially with smaller breeds like yorkies or chihuahuas that are prone to tracheal sensitivity. This can cause issues like wheezing, coughing and in more serious cases, tracheal damage. You never have to worry about this with a proper dog collar fit, as your canine companion can move comfortably and freely. A 2020 study by Nottingham Trent University and the University of Nottingham found that all collar types exert pressure sufficient to risk neck injury when a dog pulls on the lead, reinforcing why correct fit and training to walk without pulling are essential for any collared dog.

On the other side of the coin, a collar that is too loose is a hazard of a different sort. Rubbing and friction can irritate the skin and lead to troublesome hot spots and hair loss.

Reducing Neck Strain and Pressure Points

Whilst fixed collars only lock into one position, adjustable dog collars are better at spreading pressure evenly across your pup's neck. This helps to reduce the risk of pinched nerves or strained muscles if they tend to pull on the leash.

Imagine yourself wearing a turtleneck all day that is just one size too small. Now factor in the sweat, movement and the way that you would want to pull or twist occasionally to resettle. That's exactly the kind of feeling that your pup will be experiencing when wearing a tight, fixed collar. They definitely deserve better!

How Comfort Affects Training and Behavior

It makes sense that a comfortable dog is a much more focused, responsive dog. Any pup that is struggling with discomfort is much less likely to retain and follow your commands. If you notice that your furry friend is 'freezing' on walks or resisting their collar, then it probably isn't stubbornness, it is discomfort. We heard from so many happy customers about how much happier and more confident their pets are after switching to our adjustable dog collars.

For example, Rebecca adopted a terrier who always tended to freeze up mid walk. She went to a trainer who suggested desensitization, but nothing worked. That was, until she swapped out the stiff nylon collar for a more breathable single piece collar piece. Hey presto, the freezing stopped in a matter of days. That's the true power of comfort!

Leather Dog Collars
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Practical Fitting Guide

The Two Finger Rule: Getting the Perfect Fit

The easiest and most effective way to ensure a proper dog collar fit is the simple two finger rule.

  1. Put the adjustable dog collar around your pup's neck.
  2. Slide two of your fingers in between the collar and neck.
  3. If your fingers fit snuggly rather than tightly, you've got a good fit.
  4. If your fingers can't fit at all, it's too tight.
  5. If there is room to spare, then it's too loose.

The great thing about this rule is that it works for all breeds and coat types!

Adjusting for Different Activities and Seasons

How you fit your dog's collar can change depending on where they are in their routine.

  • After grooming? A smoother, thinner coat might need a notch tightened.
  • Going into winter? Loosen a notch to allow for a plush undercoat.
  • Harness training? They can benefit from a snugger fit to avoid any awkward collar shifting.

No matter what you do, it's always good to check before heading out on a long walk.

Signs Your Collar Needs Readjustment

These are the most telling signs that your pup's collar needs an adjustment.

  • They are constantly scratching at their neck.
  • They are trying to pull the collar off with the paws.
  • They are losing fur or matting around the collar.
  • There is redness or indentation when you remove the collar.
  • They are hesitant and anxious when on the leash.
Vero Wide Dog Collar in Red
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Quality and Value

The truth is that if you choose to invest in an adjustable dog collar from The Lille Bjorn, you are making a commitment to your pet to provide them long lasting comfort and safety.

You are getting a tailored fit that will last through all of the seasons, growth spurts and coat changes that come along with being a pet parent. Fast fashion collars can fray and lose shape very quickly, but these leather collars are handmade to last with super secure stitching and sustainable materials.

Ranging from $69 to $75 depending on finish and size, each order includes free shipping, and you get the wonderful belt-like adjustability from our single piece, breathable leather construction. Made to order and always prioritizing your dog's comfort and health!

There is absolutely no reason why you should have to make a choice between dog collar comfort and long term value. With our collars, you always get the benefit of both.

Frequently Asked Questions: Adjustable vs Fixed Dog Collars

Are adjustable dog collars better than fixed-size collars?

Yes, for most dogs. An adjustable collar can be corrected in seconds as your dog's neck size changes due to weight, seasonal coat thickness, or growth. A fixed-size collar that fitted correctly at purchase can be too tight or too loose within weeks of those changes occurring. A belt-hole adjustable leather collar holds its set position indefinitely and does not require replacement when your dog's measurements change slightly.

What is the difference between an adjustable and fixed collar?

A fixed-size collar comes in predetermined size ranges and cannot be altered once purchased. An adjustable collar has multiple buckle holes or a sliding mechanism allowing the wearer to change the circumference. The Lille Björn's collars use a traditional belt-hole design: no plastic sliders, no clip mechanisms, just solid punched holes that hold their position reliably through daily use without loosening over time.

How do I know if my dog's collar fits correctly?

Apply the two-finger rule: with the collar buckled, slide two flat fingers between the collar and your dog's neck. Two fingers with light resistance is the correct fit. If you cannot fit two fingers, the collar is too tight. If two fingers slide through freely and the collar rotates easily, it is too loose. Check monthly for adult dogs and fortnightly for puppies, and always recheck after grooming or seasonal coat changes.

Can adjustable collars loosen by themselves during walks?

Not with a belt-hole buckle design. Plastic slider and snap buckle adjustable collars can loosen over time with sustained tension. A traditional punched-hole buckle, like the design used on The Lille Björn's leather collars, locks into position the same way a belt buckle does and does not shift during normal use. This is one of the key reasons the belt-hole design is more reliable than plastic clip or slider alternatives for daily walking.

Should puppies wear adjustable or fixed collars?

Adjustable collars are the correct choice for puppies. Puppies grow rapidly, and a fixed-size collar that fits at eight weeks can be dangerously tight by twelve. An adjustable collar can simply be moved to the next hole as the puppy grows, providing a continuous safe fit without requiring replacement at every growth stage. Recheck the fit fortnightly during active growth periods.

Is it good for dogs to wear collars all the time?

A correctly fitted collar is safe for most dogs to wear during the day for ID and leash attachment purposes. Remove the collar during crate time, unsupervised indoor time, and sleep, as even a well-fitted collar carries a small entanglement risk when a dog is unobserved. Removing the collar regularly also gives you the opportunity to check for subtle fit changes and inspect the skin at the contact zone for any early signs of irritation.

What is a fixed collar for dogs?

A fixed collar, also called a non-adjustable collar, is manufactured in set circumference sizes without any mechanism for altering the fit after purchase. It is sized correctly at the time of buying but cannot be adjusted if the dog's neck measurement changes. For dogs with stable neck measurements and consistent coat thickness year-round, a fixed collar can work well. For most dogs, however, an adjustable design provides a more consistently correct fit over time.

The Right Fit Changes Everything

A collar that fits precisely and can be adjusted in seconds is not a luxury, it is the baseline standard that every daily walk deserves. The difference between a fixed-size collar that drifts slightly out of fit and an adjustable leather collar that you can correct at any hole is the difference between a dog that pulls, freezes, and scratches, and a dog that walks calmly and confidently.

Browse The Lille Björn's adjustable leather collar collection and find the combination of belt-hole reliability, single-piece breathable construction, and vegetable-tanned leather that gets better with every wear.

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