Neither option is universally better, but for certain dogs and situations, a harness makes a real difference to comfort and control.
What you'll need
A tape measure for chest girth, and a sense of your dog's pulling habits on leash.
Steps
- Consider a harness if your dog pulls, has a sensitive neck, or is small-breed
Harnesses distribute pressure across the chest rather than the neck, which matters more for dogs prone to tracheal sensitivity or those still learning loose-leash walking.
- Measure chest girth, not just neck size
Wrap the tape around the widest part of the chest, just behind the front legs, for an accurate fit rather than guessing from weight alone.
- Choose front-clip over back-clip for pulling issues
A front-clip attachment redirects a pulling dog back toward you, while a back-clip design is more comfortable for a dog that already walks well but tends to run with dogs that pull.
- Check for two-finger clearance once fitted
You should be able to slide two fingers under any strap. Tighter risks chafing, looser risks the dog backing out of it.
Frequently asked questions
Can a harness make pulling worse for some dogs?
A back-clip harness can slightly encourage pulling in dogs with a strong opposition reflex, which is why a front-clip design is usually recommended for that specific issue.
Is it fine to use a harness all the time instead of a collar?
Yes, many owners use a harness for walks and keep a collar just for an ID tag at home.