Look at the inside of your dog’s front leg just above the paw and you will find a small, thumb-like toe: the dewclaw. Cats have one too, at the wrist. Because these toes never touch the ground, their nails do not wear down the way the others do. That makes a dewclaw the most likely nail on the whole body to overgrow, curl and eventually dig into skin — and the easiest one to forget, especially on furry legs where it hides from view.
What Dewclaws Actually Do
Front dewclaws are not useless leftovers. In dogs they carry bone and tendon, and they help grip a chew, steady the wrist during tight turns at speed, and hook onto surfaces when climbing. Some breeds also carry rear dewclaws, or even double rear dewclaws, and those rear ones are usually attached only by skin, which makes them more prone to catching and tearing. In cats the dewclaw sits at the wrist, does not retract like the other claws, and gets used for grip when climbing and holding things. It is also not the same thing as extra toes: a polydactyl cat is born with additional digits beyond the usual five.
The Overgrowth Problem
- A dewclaw nail grows in a curve instead of wearing flat, so it curls as it lengthens.
- Given enough length it can pierce the pad or the skin at its base, leaving a sore that swells and can become infected.
- Ingrown nails are especially common on dewclaws for exactly this reason.
- Long fur over the leg hides the nail, so many owners never notice the growth until the pet is limping.
- Senior pets move less and wear every nail less, which speeds the whole process up.
Trouble announces itself clearly: limping, repeated licking at one spot on the leg, swelling around the nail base, or a yelp when the leg is touched. Any of those deserves a veterinary look rather than a wait-and-see, because a nail that has grown into skin is painful and prone to infection.
A Monthly Check and Trim Rhythm
| When | What to do |
|---|---|
| Monthly | Part the fur and look at the dewclaw nail’s length and the skin at its base |
| Every four to eight weeks | Trim it along with the rest of the nails, taking small amounts each time |
| After outdoor play | Check for splits, snags or a torn nail from catching on brush or fencing |
| Any time | If the nail has curled or the base looks red and swollen, call the vet |
Trimming is straightforward once you have seen it done: use sharp clippers, cut small amounts, and stay clear of the quick, the pink tissue inside the nail. If you have never trimmed a dewclaw, ask your vet or a veterinary nurse to show you on your own pet — one demonstration is usually all it takes.
Polydactyl Cats and Special Cases
Polydactyl cats carry one or more extra toes, and those extra nails grow just like any other — sometimes at odd angles where they can grow into the pad. The monthly check should therefore count toes, not just glance at paws, and every extra digit gets its own look and trim. As for removing dewclaws, that is a surgical procedure a vet performs only when there is a genuine medical reason, such as repeated injury; it is not a routine choice, and it is never a do-it-yourself project.
The bottom line: dewclaws and extra toes ask for very little — a monthly look, a trim on the same schedule as the other nails, and attention the moment a nail starts to curve. That small habit prevents the most painful nail problem pets get, and it takes less time than filling a water bowl.