Collar chafing on a dog's neck usually happens where the collar is too tight, too loose, wet or dirty. The good news: with the right fit, a little care and a regular look under the collar, you can prevent a lot of skin irritation. And if the skin does get irritated, that's a job for your vet.
A quick word about us: we're not a team of vets, but a small team from Braunschweig in Germany that makes collars. So what you'll find here are everyday tips and findings from the scientific literature, not diagnoses. If your dog has any problems, please always ask your vet.
How do you spot chafing and skin irritation on the neck?
Ideally, take a look under the collar once a week. If your dog has long or dense fur, take the collar off briefly, because early signs are easily hidden there. Look out for:
- thinning or broken fur and bald patches
- red, flaky or thickened skin
- damp, weeping or crusty patches
- an unpleasant smell under the collar
- frequent scratching at the neck or head shaking
- swelling, warmth or pain when touched
Slightly flattened fur under the collar is normal. Anything beyond that is worth keeping an eye on.
Why does collar chafing happen?
- Too tight: the collar presses constantly on skin and fur. In the worst case, a far too tight collar can grow into the skin. That needs a vet, and straight away.
- Too loose: the collar slides and turns with every movement, rubs the same spots over and over and can get caught more easily.
- Moisture and dirt: after rain, a swim or a muddy walk, the skin under the collar stays damp for longer. Sand and dirt that collect underneath add extra friction.
- Growth and changes: puppies grow fast, adult dogs gain or lose weight, coats change. A review in the journal Frontiers in Veterinary Science stresses that collar fit needs adjusting for weight changes, growth and coat changes.
- Matted fur: with long coats, hair likes to tangle under the collar and pull on the skin.
How should a collar fit? The two-finger rule
You should be able to slide two fingers flat between the collar and the neck without pressing. If only one fits, it's too tight. If half your hand fits, it's too loose. The American Kennel Club (AKC) recommends this rule of thumb too. Here's how to check the fit:
- Check the fit while your dog is standing, not sitting or lying down.
- The collar must not slip over the head when you gently pull it forwards.
- It lies flat and doesn't twist. The buckle and D-ring don't press on the same spot all the time.
- Readjust it after a trim, during moulting or if your dog has gained or lost weight.
For puppies, we recommend checking the fit every week. They often grow faster than you'd think.
How do you keep the collar and skin clean and dry?
According to the AKC, keeping the collar clean can help prevent skin irritation, fur loss and chafing. A simple routine is all it takes:
- After swimming or rain: take the collar off briefly, dry the neck and the collar, then put it back on.
- After muddy walks and once a week: wipe the collar with a warm, damp cloth and a little mild soap and leave it to air dry.
- Coat care: brush the fur under the collar regularly, especially if your dog has a long coat.
- Hands off home remedies: don't put creams, oils or sprays on irritated skin without checking with your vet first.
Should you take the collar off at night?
There's no fixed rule, but there are good reasons to. If your dog sleeps at home in a safe place, there's a lot to be said for taking the collar off. The skin gets a break, and the collar can't get caught on anything.
Getting caught is the most serious risk: the review in Frontiers in Veterinary Science describes strangulation accidents as the most serious documented risk of collars. That's why the AKC advises taking the collar off if in doubt, especially in a crate, when your dog is unsupervised or when they're wrestling with other dogs.
Out and about, when travelling or with dogs who like to escape, the collar with ID stays on, though. That's when it matters that your dog can be identified and you can be reached.
Collar or harness: when is a harness the better choice?
To be honest, a collar isn't the best option for every dog. A study in the Journal of the American Animal Hospital Association showed that pressure on the neck via a collar increases the pressure inside the eye, while pressure via a harness does not. The authors therefore recommend a harness for dogs with glaucoma, thin corneas or similar eye problems, especially during exercise.
For dogs that pull hard on the leash, flat-faced breeds or dogs with known neck, airway or spine problems, it's also worth talking to your vet. Many dogs then wear their collar just for their name and ID, and walk on a harness.
When should you take your dog to the vet?
If a red patch doesn't clearly improve after a few days without the collar, have it checked. Don't wait, call your vet straight away if:
- the skin is open, weeping, bleeding or pus-filled
- a patch is swollen, hot or painful
- the collar looks as if it has grown into the skin. Please don't pull it out yourself, call your vet or the out-of-hours emergency service.
- your dog coughs, gags, has trouble breathing or seems dazed after getting caught
- skin problems also appear on other parts of the body or your dog keeps scratching
Skin irritation can also be caused by allergies, parasites or infections that have nothing to do with the collar. Only your vet can tell. While the patch is irritated, it's best to leave the collar off and ask whether your dog should wear a harness for the time being.
Frequently asked questions
How tight should a dog collar be?
Tight enough that two fingers fit flat between collar and neck and the collar can't slip over the head. If only one finger fits, it's pressing. If a lot more fit, it slides and rubs. Check the fit while your dog is standing and readjust it after a trim, during moulting or after weight changes.
Can my dog wear a collar all day?
Many dogs wear their collar during the day without any problems. What matters is the right fit, a clean and dry collar and a regular look at the skin underneath. At home, at night and in the crate, there's a lot to be said for taking it off.
What should I do if the fur under the collar is getting thinner?
First check the fit and whether the collar is clean and dry. Leave the collar off more often at home and watch the patch for a few days. If it becomes red, bald, damp or itchy, have your vet take a look.
And our collars?
Our dog collars and leashes are made of PVC-coated polyester. The webbing doesn't absorb water, doesn't smell and simply wipes clean, which keeps the care routine above nice and short. Please still don't put them in the washing machine or tumble dryer, or on a radiator. And even with a waterproof collar, take it off briefly after a swim so the skin underneath can dry. Our collars are adjustable and come in S (19–26 cm), M (25–36 cm) and L (34–52 cm) neck size. Our size guide shows you which size fits.
Sources
- Ridgway, M. (2026): Health implications of dog-worn equipment: a review of known and alleged physical risks. Frontiers in Veterinary Science
- Pauli, A. M., Bentley, E., Diehl, K. A. & Miller, P. E. (2006): Effects of the application of neck pressure by a collar or harness on intraocular pressure in dogs. Journal of the American Animal Hospital Association 42(3)
- American Kennel Club: Choosing the Right Collar for Your Dog
- American Kennel Club: Could Your Dog's Collar Endanger His Life?
