Dog Harness Rubbing Under the Arms? Chafing, Bald Spots, and Matting.
Dog LoveHarness rubbing under the arms? It is usually fixable.
You take your dog's harness off after a walk and notice the skin under the front legs looks pink, the fur feels rough, or worse, there is a thin patch starting to form.
That is not your dog just being sensitive. In our salon, this is one of the most common walking gear problems we see. Owners assume the harness is safer than a collar, so it must automatically be comfortable too. Not true. A badly fitted harness can rub under the arms, break coat, create hot spots, and turn a daily walk into a slow, creeping irritation problem.
The good news is this is usually fixable. If your dog's harness is rubbing under the arms, here are the 5 biggest mistakes causing it, and exactly what to do instead.
Why harness rubbing happens in the first place
Harness rubbing is usually a friction problem.
Every time your dog walks, turns, pulls, lunges, or trots, the harness moves with them. If the straps sit too close to the armpits, slide side to side, trap moisture, or use rough material, that repeated motion starts acting like sandpaper against the skin and coat.
The chest strap is sitting too far back
This is the biggest mistake.
A lot of harnesses sit closer to the armpit crease than owners realise. When the chest strap rides too far back, every step your dog takes creates rubbing right in that busy fold behind the front legs.
That area is sensitive, warm, and constantly moving. It does not take much friction to cause a problem.
Signs this is happening
- Redness behind the front legs
- Thinning fur near the armpits
- Your dog licking the area after walks
- Knots or matting exactly where the harness line sits
What to do
The chest section should sit forward enough to avoid cutting into the armpit crease. If the harness looks like it is tucked right into the leg fold, it is too close.
A good harness should guide movement without living inside the dog's armpits.
The harness is too loose, so it twists and saws
A loose harness does not equal comfort.
When a harness is too loose, it shifts every time your dog changes direction. That side to side movement creates repeated rubbing, especially on one side. This is why some dogs only get irritation or coat damage on one underarm instead of both.
Owners often leave the harness looser because they are scared of making it too tight, but too loose is its own problem.
Signs this is happening
- The harness slides left and right
- The back panel rotates during walks
- One side rubs worse than the other
- Your dog can almost back out of it
What to do
Use the two finger rule. You should be able to slide two fingers under the straps comfortably, but the harness should not flap, rotate, or drift across the body.
Secure, not restrictive, is the goal. And if your dog has actually managed to reverse out of it, that is the same problem taken one step further: our guide on stopping a dog backing out of its harness covers the full fit check.
Worth knowing: a harness fitted over a full coat is often fitted to the hair rather than the dog, so recheck it after every groom.
The material is too rough for your dog's coat
Not all harnesses feel the same once they are actually on a moving dog.
A coarse webbing harness might feel strong in your hand, but on a dog it can be harsh on the coat and skin, especially if your dog pulls. Rough nylon, stiff edging, bulky seams, and scratchy mesh can all create friction.
This is even worse for Oodles, Golden Retrievers, long haired small breeds, double coated dogs, and dogs with finer or silkier coats.
Signs this is happening
- The skin looks fine but the coat is fraying or matting
- The harness leaves a rough line in the fur
- The rubbing gets worse when the dog pulls harder
- The harness feels stiff or scratchy around edges
What to do
Look for padding that feels smooth, breathable, and rounded at the edges. You want the harness to glide over the coat, not grip and drag against it.
If the inside feels abrasive to your hand, it will be worse on a moving dog.
Your dog is wearing the harness for too long
Harnesses are for walks, outings, and supervised wear, not all day lounging.
A lot of owners leave the harness on for hours at home, in the car, during daycare, and between walks. The longer it stays on, the more time there is for heat, moisture, and friction to build up.
Even a decent harness can start causing issues if it is worn wet, worn all day, or left on while the dog naps and shifts around.
Signs this is happening
- Irritation gets worse in summer
- The area feels damp after a walk
- Your dog wears the harness for hours, not minutes
- Rubbing keeps happening even after fit adjustments
What to do
Take the harness off when the walk is over. Let the skin and coat breathe.
Also wash the harness regularly. Dirt, salt, sand, and dried sweat all make friction worse.
The harness shape is wrong for your dog's body
Sometimes the issue is not just sizing. It is the actual shape.
Different dogs move differently. A deep chested dog, a broad Staffy build, a fluffy Groodle, and a tiny narrow framed breed do not all suit the same harness cut.
Some step in styles and bulky strap layouts simply sit badly on certain bodies. If the shape fights your dog's natural movement, you will keep seeing rubbing no matter how many times you adjust it.
Signs this is happening
- You keep adjusting it but it never sits quite right
- It dips into the armpits when your dog walks
- It looks fine standing still but shifts badly in motion
- Your dog seems reluctant when you bring the harness out
What to do
Choose a harness with thoughtful strap placement, multiple adjustment points, and a padded chest area that supports movement instead of crowding it.
A good fit is about body shape, not just size label.
How to tell if the rubbing is mild or serious
Mild rubbing
- Slight pinkness
- Flattened fur
- Minor roughness in the coat
- No broken skin
In this case, stop using the harness for a day or two, let the area settle, clean the harness, and refit properly before the next walk.
More serious rubbing
- Bald patches
- Obvious irritation
- Hot spots
- Broken skin
- Your dog licking or scratching constantly
At that point, stop using that harness completely until the area heals. If the skin is raw, inflamed, or worsening, get veterinary advice.
The fastest way to fix harness chafing
Tap each one off as you go.
For fluffy dogs especially, coat damage is often the early warning sign before skin irritation gets worse.
What to look for in a coat safe, anti chafe harness
If you are replacing a rubbing harness, look for:
- Smooth padded lining
- Rounded edges
- Adjustable fit at multiple points
- A chest design that stays clear of the armpit fold
- Breathable structure for Australian weather
- Secure hardware that does not let the harness twist mid walk
A harness should improve comfort and control at the same time.
If it gives you control but destroys the coat, it is not a good harness.
Get the size right before you buy again
Rubbing is very often a sizing problem wearing a fit problem's clothes. A chest panel that is slightly too small gets pulled back into the armpit fold on every stride, which is exactly where the damage shows up. Measure before you order.
| Size | Chest girth | Price |
|---|---|---|
| XS | 33 to 43 cmChihuahuas, Pomeranians, Yorkies, Maltese, Toy Poodles | $59.95 |
| S | 43 to 56 cmShih Tzus, Mini Dachshunds, Italian Greyhounds | $61.95 |
| M | 56 to 69 cmFrench Bulldogs, Beagles, Cocker Spaniels, many Staffies | $64.95 |
| L | 69 to 81 cmHuskies, Border Collies, bigger Staffies, many Labradors | $69.95 |
| XL | 81 to 107 cmGerman Shepherds, Rottweilers, Golden Retrievers, bigger Labradors | $74.95 |
Measure right around the chest, just behind the front legs, at the widest point. Breed is only a starting point, especially for Oodles, so trust the tape. If your dog lands between two sizes, take the larger one. Every size adjusts at four points, so there is room to bring it in.
Do not wait and see
A harness rubbing under the arms is not something to wait and see about.
Small friction problems become bald spots. Bald spots become irritation. And for curly or long coated dogs, rubbing quickly turns into matting that ends up on the grooming table.
The right harness should feel secure, sit cleanly, protect the coat, and stay out of the dog's natural movement lines.
If yours is rubbing, trust what you are seeing and fix it early.
Need a smoother, better fitted option for daily walks?
The DogLove Pro No Pull Harness is the one we fit on our own grooming clients. Smooth padded lining, rounded edges, four adjustment points, and a chest panel shaped to stay clear of the armpit fold. From $59.95 in five sizes and thirteen colours.
If the size is not right, post it back or drop it into the salon and we will swap it.
Is the size or colour you need sold out?
Some sizes and colours sell out before others. Leave your email and we will send you one message when the harnesses are back in stock. That is all it is used for.
One email about harness restocks. No newsletter, and you can ask us to remove you any time.
We will email you as soon as the harnesses are back in stock.
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Questions owners ask us
Why is my dog's harness rubbing under the arms?
Usually because it is sitting too close to the armpit crease, shifting side to side, made from rough material, or being worn too long.
Can a dog harness cause bald spots?
Yes. Repeated friction can break coat and thin fur, especially behind the front legs where movement is constant.
Can a dog harness cause matting?
Absolutely. On curly and long coated dogs, repeated rubbing under the harness line can create tangles and tight mats very quickly.
Should a harness sit close to the armpits?
No. It should feel secure, but it should not dig into the leg fold or crowd the dog's natural movement.
How tight should a dog harness be?
Snug enough that it does not twist or slide, but loose enough that you can fit two flat fingers under the straps comfortably.
What size harness stops rubbing under the arms?
The size that matches your dog's chest girth measured just behind the front legs, not the size that matches their breed or weight. Our Pro harness runs XS at 33 to 43 cm, S at 43 to 56 cm, M at 56 to 69 cm, L at 69 to 81 cm and XL at 81 to 107 cm. If your dog measures between two sizes, take the larger one and bring it in on the straps.
My dog can back out of the harness. Is that the same problem?
It is the same problem taken further. A harness loose enough to saw side to side is usually loose enough to travel forward over the shoulders when a dog reverses. Our guide on stopping a dog backing out of its harness covers the five point fit check and what to do the moment it starts.
Should dogs wear harnesses all day?
No. Harnesses are best used for walks and outings, then removed so the skin and coat can breathe.