The difference between a collar and a harness
Before you decide, it helps to understand what actually sets them apart.
A collar goes around your dog's neck and is where you clip the leash. It's simple, light and easy to put on. When your dog pulls, all of that pressure is concentrated on the neck area, which can cause discomfort or injury if the pulling is hard or constant.
A harness spreads that pressure across the chest and body. It sits around the torso, usually with straps that run across the chest and behind the front legs. When your dog pulls, the force is distributed over a wider area instead of landing on the neck alone, which lowers the risk of neck injuries.
What you should know before choosing
- Watch how your dog walks: if they pull on the leash constantly, go for a harness to protect their neck from injury and give you more control over their movements
- Always use a harness if your dog is a puppy, a small breed or a brachycephalic breed (like a bulldog or a pug), since their neck and windpipe are especially vulnerable to concentrated pressure
- Use a collar and a harness together if you've just adopted your dog or if they're easily startled, with a double-ended leash for extra safety and to prevent escapes in moments of panic
- Make sure you can fit two fingers between the harness and your dog's body: it should be snug but never tight, to avoid chafing or restricted movement
- Try both options and watch how your dog reacts over several walks: their comfort and behaviour will tell you more than any general rule about which one is right
- Adapt your choice to the activity: a collar for short, calm walks, and a dog harness and leash for long hikes or situations that call for more control and better pressure distribution
The advantages of a collar
The collar is still one of the most popular options. It's light, practical and easy to put on, which makes it a good choice for calm dogs who walk without pulling and are already used to their daily walks.
A collar also keeps your dog's ID tag visible at all times, which is essential if they ever get lost. It's discreet, it doesn't interfere with your companion's natural movement, and it's comfortable enough to wear all day.
For dogs who have learned to walk properly on the leash and have no neck or windpipe issues, a collar can be enough. That said, look at your own dog's specific behaviour before you decide.
The advantages of a harness and a dog harness and leash
A harness offers real advantages that make it the better choice for many dogs. By distributing pressure across the chest and body, it keeps all of the force off the neck and protects delicate cervical structures. That matters most for puppies, small dogs, older dogs and any dog still learning to walk properly on the leash.
It's also very useful for breeds with breathing difficulties, such as bulldogs or pugs, where any pressure on the neck makes it even harder for them to breathe. If you have a particularly active dog who tends to pull on walks, a dog harness and leash gives you more control without causing discomfort or injury.
Pairing the right harness with the right leash makes a real difference to how comfortable the walk is for both of you. Even pressure distribution protects your dog's health while letting you guide them safely.
The drawbacks of collars and harnesses
Both collars and harnesses have their limits. A collar can put excessive pressure on the neck if your dog pulls hard on the leash. That concentrated pressure can cause discomfort, breathing difficulties and even injuries to the windpipe or the cervical vertebrae, especially if the pulling is frequent or sudden. In small dogs or breeds with delicate necks, the risk is higher. It's also not the best option during the learning phase, while your dog still doesn't know how to walk without pulling.
A harness can be trickier to put on, particularly at the beginning while you and your dog are both getting used to it. Some dogs need time to adjust to the feeling of wearing something around their body. If the harness isn't fitted properly, it can rub under the front legs or get in the way of the natural movement of the shoulders. On long-haired dogs, it can tangle or flatten the coat if you don't take it off after the walk.
What to consider when choosing
To make the best decision between a collar or a harness, watch your dog and keep these key points in mind:
- Assess their behaviour on walks. Do they walk calmly beside you, or pull on the leash constantly? If they pull a lot, a harness will protect their neck from injury and give you more control over their movements.
- Consider their age and physical condition. Puppies, older dogs and dogs with health problems usually benefit more from a harness, because their bodies are more vulnerable.
- Look at their breed and build. Brachycephalic breeds (the ones with flat faces) need a harness to avoid extra pressure on the windpipe. Dogs with very thin or very thick necks are often more comfortable in a harness that spreads the pressure.
- Think about the kind of activity you do together. For short, quiet walks, a collar can be enough. For long walks, hiking or more demanding activities, a dog harness and leash offers more comfort and sustained safety.
Recommendations by size and breed
Your dog's size and breed can point you clearly towards the right accessory.
For small and toy dogs, a harness is usually the better option. Breeds like the chihuahua, the yorkshire terrier or the pomeranian have very delicate necks and can easily be injured by a collar if they pull on the leash. Pressure concentrated on such a small structure can do serious damage. A harness spreads that pressure and keeps them safer throughout the walk.
For medium and large dogs who behave well on walks, both a collar and a harness can work fine. The choice will depend more on their temperament and training than on their physical size.
For breeds with particular physical traits, such as bulldogs, pugs or boston terriers, a harness is essentially a must because of their chronic breathing problems. For breeds with long, thin necks, like greyhounds or whippets, a harness prevents injuries in an especially vulnerable area.
Collar or harness depending on training level
How well trained your dog is is another important factor when choosing between a collar or a harness.
If your dog is still learning to walk on the leash, a harness is the safer option. During this phase it's normal for them to pull, stop suddenly or change direction without warning. A harness protects their neck from those abrupt jerks that could cause injury, and makes it easier for you to guide them while they learn.
Once your dog has learned to walk properly, without pulling and responding to your cues, you can consider using a collar. And if you'd rather stick with the harness for comfort or safety, there's nothing wrong with keeping it as your permanent option.
Some dogs never quite learn to walk without pulling. In those cases, a dog harness and leash is the best long-term option, because it protects their health while you enjoy your walks together.
Harness or collar for puppies?
For puppies, the recommendation is clear: a harness is the best option for protecting their development.
Puppies are still growing, and their bones, joints and windpipe are especially delicate at this stage. Any excessive pressure on the neck can cause injuries that affect their growth. On top of that, puppies don't yet know how to walk properly on the leash, so it's completely normal for them to pull, stop or change direction constantly as they explore the world.
A harness protects their neck during this learning phase and lets you guide them gently without any risk of injury. It's also harder for a puppy to slip out of a well-fitted harness than out of a collar, which adds an extra layer of safety.
Choose a harness made specifically for puppies, one that can be adjusted as they grow. Remember that the harness should be comfortable but snug: you should be able to fit two fingers between the harness and your puppy's body.
Safety comes first
There's one more thing that often goes unnoticed and can be crucial for your dog's safety.
Adopted dogs, rescue dogs and dogs with a very insecure temperament can be easily frightened by unexpected things. A sudden noise, a motorbike, fireworks or an unfamiliar situation can trigger a fear response and make them try to bolt.
In those cases, using a collar and a harness at the same time creates a double safety system that's well worth considering. That double protection significantly reduces the risk of your dog getting loose, even in a moment of panic.
There are even leashes with two clips that let you connect the collar and the harness at once. It's a solution that can be particularly useful during the first weeks after an adoption, or when you visit new places where your dog might feel unsure.
How do you know what's best for your dog?
The answer lies in watching them closely on your walks. If they walk calmly and don't pull on the leash, a collar can be enough. If they're still learning, if they pull a lot or if they're easily startled, a harness will give them more comfort and more safety. If your dog is very fearful or you've only just adopted them, combining both accessories may be the best way to prevent an escape.
It's also worth trying both options before you decide. Sometimes a dog who has always worn a collar turns out to be more comfortable in a harness, or the other way round. Watch how your dog reacts, how they walk, and whether they show signs of discomfort such as scratching, stopping or refusing to walk. That will tell you more than any general rule.
And remember that the choice between a collar or a harness isn't final. You can use the collar for short, calm walks and a dog harness and leash for longer hikes or situations that call for more control and safety.
Find the perfect accessory for your dog
At Hola Mila we believe every dog is unique and deserves accessories that fit their specific needs. That's why our shop carries different models of collars, harnesses and leashes, designed to go with you on every adventure you share.
Every piece is carefully selected with your dog's comfort in mind and with the practicality you need day to day. Because the best accessory isn't the prettiest or the most expensive one. It's the one that makes your dog feel safe, comfortable and happy on every walk.
When you find that balance between function and style, every walk turns into a special moment that strengthens the bond between you.
