Why Harnesses Can Create Pulling Problems in Strong Dogs
- May 27
- 4 min read
Harnesses are popular, but many owners of powerful breeds eventually discover that they can create as many problems as they solve — especially when used incorrectly or worn for long periods.
For some dogs, a harness is useful and safer. For others, especially strong, muscular breeds, it can encourage pulling, discomfort, overheating, skin irritation, and poor movement.
The truth is more balanced than most people think.
Why Harnesses Can Increase Pulling
Many harnesses are designed around the dog’s chest and shoulders — the strongest part of the body.
This activates something called the opposition reflex. When pressure is applied to the chest, many dogs naturally push forward against it.
That is exactly why sled dogs wear harnesses.
Strong breeds like:
Staffordshire Bull Terrier
American Bully
Rottweiler
Mastiff
Cane Corso
can become extremely powerful in a harness because the pressure is spread across the body rather than focused around the neck.
Some dogs actually learn
“Pulling works"
Shoulder & Muscle Restriction
Poorly fitted harnesses can interfere with natural movement.
Problems may include:
restricted shoulder extension
rubbing behind the front legs
altered walking movement
pressure on chest muscles
strain across joints and tendons
In muscular breeds, this matters even more because they carry heavier upper-body mass.
Some harnesses sit directly behind the front legs where repeated rubbing can cause:
hair loss
skin irritation
hot spots
soreness under the arms
Dogs cannot tell you the harness feels uncomfortable — they simply tolerate it.
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Friction & Movement Problems During Exercise
Another issue many owners overlook is how harnesses behave when a dog is actually moving at speed.
During:
running
pulling
jumping
agility work
fast walks
rough play
the harness naturally shifts and moves against the dog’s body.
This repeated movement can create friction around:
the armpits
chest
shoulders
underside of the body
especially in muscular breeds with short coats.
Over time this may lead to:
rubbing
sore skin
hair loss
irritation
hot spots
discomfort during exercise
To reduce movement, some owners tighten the harness more firmly.
But this creates another problem.
A tighter harness may:
restrict shoulder movement
reduce natural stride length
increase pressure on muscles and joints
feel uncomfortable during normal walking
trap more heat against the body
So owners often end up balancing between:
a loose harness that moves and rubs or
a tighter harness that restricts movement and comfort
For active strong breeds, correct fit becomes extremely important — especially during exercise and longer periods of wear.
Heat & Overheating
Harnesses cover more surface area than a collar.
Thick padding and synthetic materials can trap:
heat
sweat
moisture
dirt
This becomes worse during:
summer walks
long hikes
training sessions
exercise work
Heavy-coated or muscular dogs can overheat faster when wearing bulky harnesses for extended periods.
Hygiene Problems & Bacteria Build-Up
One issue rarely discussed is hygiene.
Harness straps run underneath the dog’s body:
across the chest
under the belly
around the armpits
Male dogs may accidentally urinate onto lower straps, especially if the harness sits close to the belly area.
Over time, moisture combined with:
dirt
saliva
sweat
rainwater
urine contamination
can create bacteria build-up and unpleasant smells if the harness is not cleaned regularly.
Cheap synthetic materials can make this worse because they trap moisture and dry slowly.
Dirty harnesses may contribute to:
skin irritation
yeast problems
bacterial irritation
rubbing sores
especially in warm weather.
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False Sense of Control
Many owners feel safer using a harness, but large powerful dogs can sometimes gain more leverage through one.
If a reactive or excited dog suddenly lunges:
the owner may have less directional control
the dog can use full body strength
pulling power increases dramatically
This is why some trainers prefer structured collar work for certain strong breeds when done correctly and humanely.
When Harnesses ARE Good
Harnesses are not automatically bad.
They can be very useful for:
injured dogs
elderly dogs
short car journeys
dogs with certain throat or airway conditions
Front-clip training harnesses can also help reduce pulling in some dogs when used properly.
For activities like:
hiking
tracking
canicross
rehabilitation work
a well-designed harness may be the safest option.
The key is:
correct fit
correct use
quality materials
not leaving it on constantly
Collar vs Harness — The Real Answer
There is no perfect tool for every dog.
A poorly used collar can cause problems. A poorly used harness can also cause problems.
The best equipment depends on:
the dog’s structure
behaviour
training
strength
activity level
health condition
For strong breeds especially, comfort, hygiene, movement, and control should matter more than trends or marketing.
Final Thoughts
Harnesses became extremely popular because they are often marketed as the “safe” option.
But for muscular, high-drive dogs, the reality is more complicated.
A badly fitted or constantly worn harness may:
encourage pulling
trap heat
rub skin
hold bacteria
restrict movement
increase leverage
Good equipment should improve a dog’s comfort, movement, and safety — not simply look modern.
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