Leash walking
What should a properly fitted collar feel like on my dog?
Last updated 23 September 2026 · How we write and check this
Short answer
A well fitted collar allows exactly two fingers to slide snugly underneath it, not loosely and not with difficulty, and it should sit high on the neck, just behind the jawline, rather than low near the shoulders. It should not be able to slide forward over your dog's ears when pushed gently from behind, and there should be no red marks or hair loss underneath after normal wear. Recheck the fit every few weeks in growing puppies, since neck size can change noticeably within a month.
The two finger test in practice
Slide two fingers, held flat together, under the collar at the side of the neck, not the front, since the fit needs to work all the way around rather than just at one point. If you can fit three or more fingers easily, it is too loose, and if two fingers are a tight squeeze, it is too tight.
Position and signs of a poor fit
A collar sitting high, just behind the ears and jaw, gives you more control and is less likely to slip than one that has migrated down near the shoulders over a walk. Check under the collar weekly for the first month with a new fit, looking for flattened fur or redness that suggests it is rubbing.
Key takeaways
- Aim for exactly two fingers of snug space underneath the collar.
- Position the collar high on the neck rather than down near the shoulders.
- Recheck fit regularly in growing puppies, since neck size changes fast.