How to Choose the Right Size Harness for Your Dog: A Fit Guide from HAPPUP

Choosing the right harness size is key to your dog’s comfort, safety, and overall walking experience. A harness that’s too loose can slip off, while one that’s too tight can cause discomfort — or even injury.

At HAPPUP, we design our harnesses for an adjustable, comfy fit. Here’s our simple guide to help you pick the right size for your pup.

1. Measure Your Dog Correctly

Before buying, grab a soft measuring tape and take two key measurements:

  • Chest Girth (most important):
    Wrap the tape around the widest part of your dog’s chest, just behind the front legs.
  • Neck Girth (if applicable):
    Measure around the base of the neck, where a collar would naturally sit.

📏 Tip: Make sure the tape is snug but not tight. You should be able to fit two fingers between the tape and your dog’s body.

Each HAPPUP harness includes a detailed size chart based on girth ranges. For example:

Size Chest Girth Typical Breed Examples
XS 30 – 38 cm Chihuahua, Mini Dachshund
S 38 – 48 cm Toy Poodle, Pomeranian
M 48 – 60 cm Cavoodle, French Bulldog
L 60 – 75 cm Cocker Spaniel, Beagle

 

🛒 You can find the size chart on every product page. If your dog is between sizes, we recommend sizing up for better comfort and adjustability.

3. Adjustable Straps Are Your Best Friend

Our HAPPUP LED Harnesses are built with multiple adjustment points to help you find the perfect fit. Once adjusted, the harness should:

  • Sit flat against the chest (no sagging)
  • Allow free movement without rubbing under the legs
  • Stay snug without squeezing

🎯 Pro tip: Adjust the harness with your dog standing naturally, not sitting.

4. Pay Attention to Breed & Body Type

Some dogs (like poodles or dachshunds) have unique proportions, so sizing by weight alone doesn’t always work. That’s why measurements are more reliable.

5. Try It On, Then Observe

Once your harness arrives:

  • Put it on and check the fit
  • Take your dog for a short walk
  • Watch for signs of rubbing, slipping, or resistance

🧼 Bonus: All HAPPUP harnesses are easy to clean and made with soft, breathable material, so even sensitive pups stay happy.

Final Thoughts

A well-fitted harness means safer, happier walks for you and your dog. Use this guide to find your pup’s perfect size and enjoy worry-free adventures with HAPPUP.

👀 Still shopping?
Explore our full range now!

Back to blog