Harness vs Collar: Which Is Better for Your Dog?

It's one of the most common questions new dog owners ask: should I use a harness or a collar? The answer depends on your dog's size, behaviour, and how you walk them — but for most dogs, especially large breeds, a harness wins.

The Case for Collars

Collars are convenient. They're lightweight, easy to put on, and great for holding ID tags. For dogs that walk calmly on a loose leash and don't pull, a collar is perfectly fine for everyday walks.

However, collars have a significant downside: all leash pressure is concentrated on the neck. For dogs that pull — even occasionally — this can cause serious problems.

The Risks of Collars for Pulling Dogs

• Tracheal damage — repeated pressure on the trachea can cause coughing, collapsing trachea, and long-term respiratory issues, especially in brachycephalic breeds (Pugs, Bulldogs, French Bulldogs).
• Neck injuries — sudden lunges can strain the cervical spine and surrounding muscles.
• Thyroid gland compression — the thyroid gland sits near the front of the neck and can be affected by repeated collar pressure.
• Eye pressure — studies suggest collar pressure can increase intraocular pressure, a concern for breeds prone to eye conditions.

Why Harnesses Are Better for Most Dogs

A well-fitted harness distributes leash pressure across the chest, shoulders, and back — a much larger and more robust surface area. This eliminates neck strain entirely and makes walks safer and more comfortable for your dog.

For large dogs and pullers specifically, a no-pull harness with a front chest clip adds an extra layer of control. When your dog lunges forward, the front clip turns them back toward you — naturally discouraging pulling without any pain or force.

When to Use Each

• Collar: ID tags, calm dogs on loose leash, short trips.
• Harness: Daily walks, training, hiking, dogs that pull, large breeds, puppies still learning leash manners.

The Best of Both Worlds

Many owners use both — a collar for ID tags and a harness for walks. The PetPeek No Pull Dog Harness is designed for exactly this: a secure, adjustable harness for walks and adventures, while your dog keeps their collar for ID. With dual metal leash clips, padded air mesh, and 360° reflective strips, it's built for large dogs who need real control — without compromising comfort.