How Tight Should a Dog Collar Be? The 2-Finger Rule and Other Tips

Every dog owner worries about whether their dog’s collar is too tight or too loose. It’s completely natural — we want to keep our pets safe and comfortable. Fortunately, veterinarians have made this easier by developing a simple rule that helps determine the ideal collar fit, preventing both rubbing and slipping. Below, we explain this rule in detail so you can say goodbye to collar-fitting problems for good.

The Two-Finger Rule

The easiest and most widely used method is the two-finger rule. It’s quick, simple, and works for dogs of all sizes.

How does it work?
First, fasten the collar around your dog’s neck so it feels comfortable. Then, slide two flat (not stacked) fingers between the collar and your dog’s neck. You should feel slight resistance — your fingers shouldn’t slip in too easily, but they shouldn’t be squeezed tightly either. If they fit just right, the collar size is perfect.

• Too tight? If you can’t fit your fingers or it’s a struggle, loosen the collar by 1–2 holes and check again.

• Too loose? If your fingers fit too easily or there’s a lot of space, tighten the collar by 1–2 holes.

For puppies and fluffy breeds, experts recommend checking the fit weekly. Puppies grow fast, and thick fur can hide a collar that’s too tight. Poor-quality collars can also cause matting over time. (We also have a post explaining which collar materials are best for your dog.)

How to Measure Your Dog’s Neck

To get an accurate measurement: wrap a soft measuring tape around the middle of your dog’s neck. The tape should be snug, but not tight. Then:

• Add 1 inch for small dogs

• Add 2 inches for medium or large dogs

Use this final number as your collar size.

Signs Your Dog’s Collar Needs Adjustment

Not sure if your dog’s collar fits correctly? Watch for these signs:

• Redness or bald spots under the collar

• Constant scratching around the collar

• The collar slips off easily

• Difficulty attaching the leash

If you notice any of these, remove the collar and adjust the fit. You may also want to consider switching to a different material if the problem continues.

Finding the Perfect Collar

At Puccissimé Pet Couture, we’ve been creating adjustable collars and harnesses for small and medium dogs for nearly 10 years. We focus on comfort and quality, using soft, breathable materials designed with your dog’s safety and well-being in mind.

Explore our collection of collars.

Final Thoughts

Your dog wears their collar every day — it should be safe, soft, and stylish. By using the two-finger rule, measuring correctly, and choosing high-quality materials, you can ensure your pup stays comfortable and protected.

Have questions about sizing or materials? Send us a message — we’re always happy to help you find the perfect fit for your furry friend.