Run your thumb up the inside of your dog's front leg, an inch or two above the paw, and press in through the hair until you feel skin. There's a nail up there. On a short-coated dog that still has them, you can see it from across the room. On a spaniel, a doodle, a setter, a Pomeranian — anything carrying a bit of hair on its legs — you can go years without once laying eyes on it. And on plenty of dogs there's nothing there to find: breeders often remove front dewclaws in a puppy's first few days, and some breed standards call for it — the AKC's Weimaraner standard, for one, says they should be removed, so a Weim with dewclaws is the exception rather than the rule.
That's the dewclaw, and it's usually the first nail on a dog to get away from you. Not because there's anything delicate about it. Because of a boring mechanical fact: it never touches the ground. Every other nail gets sanded down a little every time your dog trots along a sidewalk or across a driveway. The dewclaw gets none of that. It just grows.
What a dewclaw is
Roughly, it's a thumb. The American Kennel Club describes front dewclaws as usually connected to the leg by ligament and bone, and there's a decent case that they do real work — gripping a chew between the front paws, adding traction on a slick floor, helping steady the wrist when a dog turns hard at speed. It isn't a vestigial flap of nothing.
Rear dewclaws are a different animal. When a dog has them at all, AKC notes they're typically attached by skin alone, which is why they sit loose and floppy against the leg rather than tight to it. Plenty of dogs don't have them. A few breeds are supposed to: Great Pyrenees, Briards, Beaucerons and Icelandic Sheepdogs can carry doubles on the back legs, and in some of those breeds it's written into the breed standard.
All of which adds up to the first practical thing to know: your dog might have none of these, or two, or four, or six, and the number isn't something you can eyeball from the couch. Check all four legs before you decide you're done.
Why it's the nail that goes wrong first
Wear is contact, and contact is the whole difference. The sixteen nails that meet the ground get at least some free filing every day. The dewclaw gets exactly none. Same growth rate, no brake — which is why on the dog whose other nails look perfectly tidy, the dewclaw can be running months ahead of them.
And it doesn't just get long. It curves. A dewclaw grows in an arc, and with nothing to blunt it, the arc keeps going — the tip comes around, turns back toward the leg, and eventually reaches skin. At that point it has stopped being a grooming job and become a vet visit, and it's a sore one for the dog. You want to be catching this a long way earlier, which is easy, because catching it early takes about twenty seconds.
The reason you've never noticed it
The annoying part is the symmetry. The dogs most likely to have an overgrown dewclaw are the dogs whose legs carry the most coat. Feathering on a Golden or a Cocker drapes straight over the spot. A doodle's leg hair grows up through and around it. On a Pom it's somewhere inside the fluff. And if you brush the outside of the leg — which is what nearly everyone does, because that's the part you can see — the brush glides over the top and tells you nothing at all. Our piece on whether to trim your dog's feathering gets into what all that leg hair is doing the rest of the time.
So this isn't a looking job. It's a feeling job, and it wants a thumb.
The twenty-second check
- Sit beside your dog rather than looming over them, and start with whichever leg they mind least.
- Slide your thumb up the inside of the front leg from the paw. Two inches, tops. Press in through the coat until you're on skin.
- The dewclaw feels like a hard little ridge with a point on it. Once you've found it, part the hair and look at it.
- Judge the curve, not the length. A short dewclaw already bending into a C is further down the road than a straighter one twice its size.
- Do the back legs too, even if you're certain there's nothing there. It's the easiest step to skip and the one most likely to turn up a surprise.
Once a month is plenty for most dogs — roughly the same rhythm you'd use for the rest of the nails. If you want the longer version of why nail length matters beyond the nail itself, our post on overgrown nails and how they change a dog's gait covers it.
If it's already long
The quick — the blood vessel and nerve running inside the nail — travels out with the nail as it grows. On a dewclaw that's been long for a while, the quick is long too, and that's why you can't simply cut it back to where you'd like it in one pass. The approach that works is unglamorous: take a little, wait, take a little more. Preventive Vet describes the same pattern for overgrown nails generally — frequent small trims let the quick withdraw, and the nail can come shorter over the following weeks.
Two cautions. If the dewclaw has already curled into the skin, or the area around it is swollen, red, warm, or smells off, that's a vet question rather than a grooming one, and it isn't ours to sort out either. And if the nail is dark, you're cutting blind on a nail that sits right against a leg, with no daylight behind it — a fair reason to hand it to someone who trims nails all day.
If your dog won't let you near the foot
Very common, and the dewclaw makes it worse than a regular nail does, because reaching it means holding the leg in a position most dogs would rather not be held in. That's a handling problem, not a stubbornness problem, and it's the kind of thing that shifts over a few weeks at home. We wrote a long one on working on paw handling at home if you want somewhere to start.
In the meantime, though: not checking is not a plan. The dewclaw is indifferent to whether anyone got around to it.
Where this fits with a groom
A nail trim and file is part of a full groom, and it's also bookable on its own — nail trims at our St. Charles salon start at $20, no haircut attached. If you'd rather not guess whether your dog has rear dewclaws, or how far along the front ones are, ask us to point them out at your next appointment. It's a far easier thing to learn with the leg in front of you than from a paragraph on the internet.
And if it's been a while and you'd like someone else to be the one holding the foot, booking's here whenever you need it.