Dog Collar Size Guide: How to Measure and Choose the Right Fit
By Beast & Buckle | Published: 2026-10-25
Category: Buying Guides
Learn how to measure your dog for a comfortable, adjustable collar. This guide covers sizing steps, fit checks, and when to choose a collar over a harness.
Quick answer
Measure your dog's neck circumference with a soft tape, add two fingers of space, and choose an adjustable collar that can tighten or loosen by at least one inch.
Why adjustable collars make sizing easier
Not every dog has a perfectly uniform neck shape. Some have thicker fur, loose skin, or a neck that tapers toward the head. An adjustable collar lets you fine-tune the fit after you put it on, which is especially helpful if your dog is still growing or changes weight between seasons.
Beast & Buckle collars are designed with adjustable fit in mind. Each collar can be tightened or loosened to sit comfortably on your dog's neck, so you aren't stuck with a single fixed size.
When a collar is the right choice over a harness
Harnesses are great for dogs that pull or need extra control, but a collar is often the better choice for calm walks, ID tags, and quick on-and-off use. Collars are also easier to clean and less bulky for dogs with short coats.
If your dog has a respiratory condition, a narrow trachea, or tends to lunge, a harness is safer. For everyday walks with a well-behaved dog, a collar is perfectly fine.
How to choose the right collar size
- Measure with a soft tape: Wrap a flexible measuring tape around the middle of your dog's neck, where the collar will naturally sit. Keep it snug but not tight. Record the measurement in inches. If you don't have a soft tape, use a string and then measure it against a ruler.
- Add two fingers of space: After measuring, add about two finger widths (roughly 1-1.5 inches) to the measurement. This ensures the collar is snug enough not to slip off but loose enough to avoid choking. A collar that is too tight can cause discomfort or skin irritation; too loose and your dog might back out of it.
- Check the adjustable range: Look at the collar's size options and choose one where your dog's neck measurement plus the two-finger allowance falls within the adjustable range. A good adjustable collar can be tightened or loosened by at least one inch. Beast & Buckle collars are fully adjustable within their size range, so you can fine-tune the fit after putting it on.
- Perform the two-finger test: Once the collar is on, slide two fingers between the collar and your dog's neck. You should be able to fit them comfortably without forcing. If you can't, it's too tight. If you can fit more than two fingers, it's too loose. Repeat this test periodically, especially for growing puppies or dogs that gain/lose weight.
Collar options that fit your dog
- Frenchies vs. Everybody Dog Collar: This collar features the Frenchies vs. Everybody pattern and is built to be comfortable on your neck and easy to wash. The washable material means you can keep the collar clean even after muddy walks, and the adjustable fit ensures it stays snug without slipping.
Frenchies vs. Everybody Dog Collar - Autumn Vibes Dog Collar: This collar features the Autumn Vibes pattern and is built to be comfortable on your neck and easy to wash. If you want a seasonal look that still offers the same practical adjustable fit and easy cleaning, this pattern gives you that option without sacrificing comfort.
Autumn Vibes Dog Collar
Is a collar right for your dog?
Best for
- Calm dogs that don't pull on leash
- Quick walks, potty breaks, and ID tag attachment
- Dogs with short coats or sensitive skin who need a lightweight option
Not for
- Dogs that pull hard or lunge (use a harness instead)
- Dogs with respiratory issues or a narrow trachea
