The Complete Guide to Measuring Dog Collar Size (and Choosing the Right Leash)

Making sure your dog’s collar fits properly is one of the simplest but most important ways to keep them safe, comfortable, and secure. A collar that’s too tight can cause discomfort or even injury, while one that’s too loose may slip off during a walk.

This step-by-step guide covers how to measure your dog’s neck, how to choose the right collar, types of collars and leashes, safety tips, and more.

How to Measure Your Dog’s Neck Correctly

You don’t need special tools—just a soft tape measure, or a piece of string/ribbon and a ruler.

1. Find the correct spot – wrap the tape measure around the base of your dog’s neck, where a collar naturally sits.

2. Add comfort allowance – ensure you can slip two fingers between the tape and your dog’s neck. This creates a snug but not restrictive fit.

3. Read the size in cm – this is your dog’s “neck measurement.”

4. Choose the collar size – pick an adjustable collar where your dog’s measurement sits close to the middle of the range.

👉 Example: If your dog’s neck measures 36 cm, choose a collar adjustable from around 32–40 cm. That way, it’s not maxed out tight or too loose at the largest hole.

Adjustments for Special Cases

• Chain or slip collars: Add 2–5 cm to your measurement.

• Growing puppies: Pick an adjustable collar with room to grow, and check fit every 1–2 weeks.

• Fluffy coats or seasonal shedding: Allow a little extra space if your dog has thick fur.

• Slim-neck breeds (greyhounds, whippets): Consider a martingale collar, which avoids slipping.

🐕 Dog Collar Size Chart (Weight & Neck Guide)

Every dog is unique, but this chart can help you estimate before measuring:

⚠️ Always measure your dog directly—breed averages can vary a lot.

🐾 How Often Should You Recheck Collar Fit?

• Puppies: Every 1–2 weeks (they grow fast!).

• Adult dogs: Monthly is enough, or after noticeable weight change.

• Long-haired breeds: Check more often during shedding/grooming—collars may loosen up.

Signs Your Dog’s Collar Doesn’t Fit Properly

✅ Signs it fits well:

• You can slip two fingers under comfortably.

• The collar sits snug at the neck base without moving up toward the ears.

❌ Bad fit warning signs:

• Red marks, chafing, or missing fur under the collar.

• Collar easily slips off the head during a walk.

• Dog constantly scratches or paws at the collar.

• Excessive jingling of tags (usually too loose).

Types of Dog Collars (and When to Use Them)

Not all collars are the same. Choosing the right type makes a big difference.

• Flat buckle collar – Everyday use, works for most dogs.

• Martingale collar – Best for slim-necked breeds like Whippets and Greyhounds (prevents slipping out).

• Harnesses – Recommended for dogs that pull strongly, small breeds with delicate necks, or brachycephalic breeds (e.g., Pugs, Bulldogs).

• Head collars – Training tool for strong pullers, but should be introduced carefully.

• GPS collars / smart collars – Ideal for adventurous dogs or rural walkers.

• Breakaway collars – Designed to snap open if caught, ideal if your dog spends time unsupervised outdoors.

Choosing the Perfect Leash Length

The right leash balances freedom and control, depending on where you walk your dog:

• 120 cm (4 ft): Best for busy cities, crowded paths, or training.

• 180 cm (6 ft): Standard everyday leash—gives most dogs room to explore.

• 240–300 cm (8–10 ft): Good for quiet open spaces, parks.

• 10–15 m (30–50 ft): Long training leads for recall or exercise in open areas (not for streets).

Leash Materials & Width

• Nylon: Lightweight, weatherproof, affordable.

• Leather: Durable, comfortable in hand, long-lasting.

• Rope: Rugged, ideal for pullers or chewers.

• Chain: Rare today, but sometimes used for strong chewers.

👉 Width matters too:

• Small dogs (<10 kg): 1–1.5 cm wide leash.

• Medium dogs (10–25 kg): 1.5–2 cm.

• Large dogs (25+ kg): 2–2.5+ cm for extra control.

Collar & Leash Safety Tips

• Always attach an ID tag with contact details, even if your dog is microchipped.

• Use reflective collars or LED lights for night walks.

• Check for wear & tear: replace collars or leashes that are frayed or weakened.

• For dogs that pull hard, switch to a harness to prevent neck injury.

• Never leave a dog unattended wearing a tightening collar (like slip or choke chains).

Climate & Lifestyle Considerations

• Hot, humid climates: Choose breathable nylon or mesh collars to prevent rashes.

• Cold weather: Padded or fleece-lined collars for comfort.

• Active lifestyles (running, hiking): Hands-free waist leashes or double-clip harness systems work best.

Final Thoughts

Measuring your dog’s collar size may only take a minute—but getting it right means more comfort, more safety and more enjoyable walks. Combine the right collar and leash with regular fit checks, and you’ll keep your dog protected at every stage of life.

If there’s any doubt about choosing the right collar or leash for your dog, don’t hesitate to reach out! Our team is here to help you find the perfect fit for your furry friend’s safety and comfort. Contact us anytime for personalised advice and recommendations.

👉 Remember: the perfect collar is one that fits your dog’s neck, lifestyle, and personality.