Choosing the right harness for your puppy is one of the most important early decisions you'll make — especially if you're starting leash training or have a puppy who pulls, jumps, or is still learning to walk calmly.
But with so many options available, it's easy to feel overwhelmed. Should you use a harness or collar? What features actually matter? And how do you find one that fits a puppy who's still growing?
This guide walks you through everything you need to know to choose the best harness for your puppy — with practical advice, sizing tips, and recommendations for adjustable options that grow with your dog.
Harness or Leash for Puppy Training?
Let's start with the most common question: should you use a harness or a collar for your puppy?
For most puppies, a harness is the safer and more effective choice.
Why Harnesses Are Better for Puppies
- Reduces neck strain: Puppies who pull on a collar can damage their trachea, neck, and spine. A harness distributes pressure across the chest and shoulders instead.
- Gives you better control: Harnesses provide more leverage and control, especially with energetic or strong puppies.
- Prevents escape: Puppies can slip out of collars more easily. A well-fitted harness is much more secure.
- Supports gentle training: Harnesses make it easier to guide your puppy without causing discomfort or fear.
If you're just starting out with your new puppy, our New Puppy Starter Bundle includes everything you need for calm training and daily routines, including leash training guidance.
When to use a collar: Collars are fine for holding ID tags and for calm, well-trained dogs. But for active puppies still learning leash manners, a harness is the safer option.
Key Features to Look for in a Puppy Harness
Not all harnesses are created equal. Here's what to prioritize when choosing one for your puppy:
1. Adjustability
Puppies grow fast. An adjustable harness with multiple adjustment points (chest, neck, and girth) will last longer and ensure a proper fit as your puppy grows.
Look for: Harnesses with at least 2-4 adjustment points
2. Padding and Comfort
Thin straps can dig into your puppy's skin, especially during training. Padded harnesses are more comfortable for longer walks and active puppies.
Look for: Soft, breathable padding on the chest and straps
3. Front or Back Clip?
Where the leash attaches makes a big difference:
- Back clip: Best for calm puppies who don't pull. Comfortable for casual walks.
- Front clip: Best for puppies who pull. Redirects their momentum toward you, making training easier.
- Dual clip: Offers both options — ideal for training flexibility.
For puppy training, a front-clip or dual-clip harness is usually the best choice.
4. Easy On/Off Design
Puppies can be wiggly and impatient. Look for harnesses that are easy to put on and take off, especially step-in or overhead designs with quick-release buckles.
5. Durable, Washable Materials
Puppies get messy. Choose a harness made from durable, machine-washable materials that can handle muddy paws, drool, and outdoor adventures.
How to Size a Harness for a Growing Puppy
Getting the right fit is crucial for comfort and safety. Here's how to measure your puppy for a harness:
Step 1: Measure the Chest Girth
Use a soft measuring tape to measure around the widest part of your puppy's chest, just behind the front legs. Add 2 inches for comfort.
Step 2: Measure the Neck
Measure around the base of the neck where a collar would sit. Again, add 2 inches.
Step 3: Check the Size Chart
Every brand sizes differently, so always check the manufacturer's size chart. When in doubt, size up — you can adjust straps down, but you can't make a too-small harness bigger.
Fit Check: The Two-Finger Rule
Once the harness is on, you should be able to fit two fingers comfortably between the harness and your puppy's body. If it's tighter, it's too small. If you can fit your whole hand, it's too loose.
Best Adjustable Puppy Harnesses for Growing Dogs
Here are some top-rated adjustable harness options that work well for puppies:
1. Front-Clip No-Pull Harness
Best for: Puppies who pull during walks
Features: Front chest clip redirects pulling, padded straps, multiple adjustment points, reflective stitching for visibility
Why it works: The front clip naturally discourages pulling without discomfort, making leash training easier and more effective. For puppies with lots of energy who need extra guidance, our Life With a High-Energy Puppy guide offers strategies for managing pulling and channeling that energy positively.
→ View recommended front-clip harness
2. Dual-Clip Adjustable Harness
Best for: Versatile training and everyday use
Features: Both front and back clips, 4-point adjustability, breathable mesh padding, easy step-in design
Why it works: Gives you flexibility to switch between training mode (front clip) and casual walks (back clip) as your puppy improves.
→ View recommended dual-clip harness
3. Lightweight Step-In Harness
Best for: Small or nervous puppies
Features: Simple step-in design, soft mesh construction, adjustable chest and girth, lightweight and breathable
Why it works: Easy to put on without going over the head, which is less stressful for anxious or small-breed puppies.
→ View recommended step-in harness
Common Harness Mistakes to Avoid
1. Buying Based on Age Instead of Size
Puppies grow at different rates. Always measure your puppy and use the size chart rather than relying on age or breed estimates.
2. Choosing Fashion Over Function
Cute designs are great, but comfort, adjustability, and clip placement matter more for training and safety.
3. Not Adjusting as Your Puppy Grows
Check the fit every few weeks. A harness that fit perfectly last month might be too tight now.
4. Using a Harness That's Too Loose
A loose harness can chafe, twist, or allow your puppy to escape. Always do the two-finger fit test.
Harness Training Tips for Puppies
Even the best harness won't help if your puppy hates wearing it. Here's how to introduce a harness gently:
- Let them sniff it first: Let your puppy investigate the harness before putting it on.
- Use treats and praise: Reward your puppy for staying calm while you put the harness on.
- Start with short sessions: Wear the harness indoors for a few minutes at a time before heading outside.
- Pair it with positive experiences: Put the harness on before meals, playtime, or walks so your puppy associates it with good things.
If your puppy is struggling with nighttime routines or settling down after walks, Calm Nights with Your New Puppy helps you build calming evening routines.
For more detailed leash training guidance, check out our guide: A Gentle Way to Start Leash Training With Your Puppy
Final Thoughts
Choosing the right harness for your puppy doesn't have to be complicated. Focus on adjustability, comfort, and the right clip placement for your training goals, and you'll set your puppy up for safe, enjoyable walks.
Whether you're dealing with a puppy who pulls, a nervous first-time walker, or a fast-growing pup, an adjustable, well-fitted harness makes all the difference.
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