Choosing the right dog harness is only part of the equation. Just as important is making sure the harness actually fits your dog properly.
A poorly fitted harness can twist around the dog’s body, rub under the armpits, or restrict natural movement. In some cases it can even make walks uncomfortable for your dog.
In this guide, I’ll show you a quick way to check if your dog’s harness fits correctly and highlight some common mistakes dog owners make.
How to Fit a Dog Harness Properly (Quick Checklist)
To check if a dog harness fits correctly:
- Use the two-finger rule – you should be able to slide two fingers between the harness and your dog.
- Check strap position – the girth strap should sit behind the front legs, not rubbing under the armpit.
- Ensure free shoulder movement – your dog should be able to move their shoulders naturally when walking.
- Check stability – the harness should stay centred and not rotate around the dog’s body.
A properly fitted harness should feel snug, stable and allow your dog to move freely.
Why Harness Fit Matters
When a harness fits properly, it distributes pressure comfortably across your dog’s body and stays secure during walks.
If the harness is too loose, it may rotate or slip. If it’s too tight or poorly positioned, it can restrict movement or cause rubbing.
Guidance from organisations such as the RSPCA also emphasises the importance of comfortable walking equipment that allows dogs to move naturally.
If your dog pulls on the lead, remember that equipment alone doesn’t teach loose lead walking. I explain this further in Do Harnesses Teach Dogs to Pull?.
Signs Your Dog’s Harness Doesn’t Fit
Here are some common signs that a harness may not be fitted correctly:
- The harness rotates around your dog’s body.
- The straps rub under the armpits.
- Your dog’s stride looks shorter or restricted.
- The harness sits too close to the elbow joint.
- Your dog tries to scratch or remove the harness.
If you notice these signs, it may be time to adjust the fit or consider a different harness design.
You may also want to read my article on two dog harness types I avoid, where I explain some harness designs that can restrict movement.
How Harness Design Affects Movement
Not all harnesses are designed the same. The position of the straps can influence how freely your dog moves when walking.
Harnesses that sit across the shoulders may restrict natural stride length, while designs that leave the shoulders free allow more natural movement.
When choosing a harness, look for designs that:
- Allow full shoulder movement
- Place the girth strap behind the front legs
- Distribute pressure across the chest
- Stay centred without twisting
You can read more about this in Important Info: Avoid Horizontal Strap Harnesses.
Harness Designs and Dog Preference
There are many different harness designs available. The best harness is the one that fits your dog properly and allows full natural movement.
Some dogs also dislike harnesses going over their head. In those cases, harnesses that clip around the neck can be easier to use.
For everyday walks, I often recommend well-fitting harnesses such as the Ruffwear Front Range Harness or the lightweight option available here: Ruffwear Lightweight Harness.
Pairing a harness with a training lead like the Halti Training Lead can also give you more flexibility during training.
You might also find my guide on front and back clip harness misuse useful.
Common Dog Harness Mistakes
- Adjusting the harness while it’s on the dog. Adjust the harness off the dog first, then place it on once the straps are set.
- Leaving excess straps loose. Tighten adjusters so straps do not flap around.
- Leaving the harness on all day. Harnesses are designed for walks, not constant wear.
- Using a walking harness in the car. If your dog travels in a harness it should be car-specific and crash tested.
For more training advice, see Loose Lead Walking Starts Here.
Essential Equipment for Safe Walks
A harness is only part of safe walking equipment.
I always recommend ensuring your dog wears identification. A durable option is the Silicone ID Tag. Learn more in Don’t Lose Your Dog – Do Use ID Tags.
If your dog also wears a collar, correct fitting matters there too. See Correct Collar Fitting and Collars Can Be Deadly.
You can explore all the walking equipment I recommend here: HPDT Training Aids.
FAQ
How tight should a dog harness be?
A dog harness should be snug but not tight. You should be able to slide two fingers between the harness and your dog’s body.
Where should the straps sit on a dog harness?
The girth strap should sit behind the front legs and elbows to avoid rubbing and allow free movement.
Can dogs wear a harness all day?
No. Harnesses are designed for walks or training sessions and should be removed afterwards to prevent rubbing or irritation.
Are harnesses better than collars for walking?
Harnesses distribute pressure across the body rather than the neck, which many trainers prefer. However, correct fit and training remain the most important factors.
Related Articles:
