A collar that's too tight is uncomfortable, and one that's too loose can slip off. A quick check will tell you if yours is right.
The two-finger rule
With the collar fastened, slide two fingers flat between the collar and your dog's neck. If they fit comfortably, the fit is usually about right. If it's hard to get them in, it's too tight. If you can fit much more than two, it may be too loose.
For very small dogs, one finger may be more suitable. For large dogs, you may find it easier to check with a flat hand.
Signs it might be too tight
- Your dog seems to scratch at it or shake their head often
- Marks or flattened fur around the neck
- Coughing or noisy breathing (talk to your vet if you notice this)
Signs it might be too loose
- It slides around the neck or rotates freely
- It can be pulled over the head
- It sits down at the shoulders
Check regularly
Coats change with the seasons, dogs gain and lose weight, and puppies grow. Re-check the fit every few weeks, especially for puppies.
After a wash or swim
Wet collars can shrink or stretch a little depending on the material. Check the fit after your dog has been in the water.
When in doubt
If you're not sure about fit, ask your vet or a trainer to check it. Measuring properly in the first place also helps. See how to measure a dog for a collar.
How to do the two-finger check
- Fasten the collar on its usual hole.
- Slide two flat fingers under the collar at the front and at the sides.
- If they slide in with slight resistance, the fit is generally about right.
- If it's very tight, loosen the collar by a hole.
- If there's a lot of space, tighten it by a hole.
Adjustments for different dogs
- Small dogs and puppies: One finger may be enough, since the neck is small.
- Large dogs: Two fingers still works, but check by eye that the collar isn't sliding.
- Fluffy dogs: Make sure you're feeling the neck, not just the fur.
- Dogs with narrow heads (like some sighthounds): A collar can slip over the head. Ask a vet or trainer about the right kind of collar.
Signs of a good fit
- The collar stays in place without turning.
- Your dog isn't scratching at it.
- You can see and feel the collar without any pinching.
- The collar doesn't ride up behind the ears.
Frequently asked questions
How often should I check?
Check the fit weekly for puppies, and monthly for adult dogs. Check after grooming and after your dog has been swimming.
Should the collar be able to turn?
It should turn slightly, but not spin freely.
What if my dog slips out of the collar?
It may be too loose, or the type of collar may not suit your dog's head shape. Ask a trainer or vet.
Does the two-finger rule apply to every collar?
It's a general guide. Follow any specific advice from your vet or the collar's instructions.
Where can I find the right size?
Use our size guide and read how to measure a dog for a collar.
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Our dog collars are adjustable, and the size guide shows the ranges.
