What Causes a Dog's Interdigital Dermatitis?

You might notice your dog limping or licking their paws more than usual, and that’s often the first sign of interdigital dermatitis—those sore, red spots between their toes. It’s a common issue, but figuring out what’s causing it helps you stop it from getting worse. Most cases start with something that irritates or damages the delicate skin between their paw pads.

Moisture is a big trigger for this condition. After a walk in the rain or a bath, if you don’t dry your dog’s paws thoroughly, the dampness gets trapped between their toes. This creates the perfect environment for bacteria or yeast to grow—especially in areas with humid summers or frequent rain. Even letting them stand in a wet dog bed for too long can set it off, so keeping their paws dry is key.

Foreign objects stuck in their paws are another common cause, and it’s easy to miss them. Grass awns, tiny thorns from local plants, or even small pebbles can work their way between toes while you’re out on walks—whether that’s in a neighborhood park or a wooded trail. Always check their paws after outdoor time, especially if your area has lots of tall grass or wild vegetation (many local parks post warnings about problematic plants, so keep an eye out).

Allergies play a role too, and they’re often linked to things common in everyday life. Pollen from regional trees or flowers, dust mites in your home, or even ingredients in their food can cause their paws to itch. When they lick or chew to soothe the itch, they break the skin, making it easier for infection to set in. If you suspect allergies, a vet can help identify triggers—important because untreated allergies can lead to recurring dermatitis.

Overgrown nails or tight paw fur can also contribute. When nails get too long, they change how your dog stands and walks, putting extra pressure on the skin between toes. Mats in paw fur can trap dirt and moisture, too. Many groomers in pet-friendly areas follow guidelines for safe paw care, so if you’re unsure how to trim nails or fur, leaving it to a pro avoids accidental cuts that could lead to infection.

Catching the cause early makes treating interdigital dermatitis much simpler. If you see your dog in discomfort, don’t brush it off—check their paws gently and reach out to a vet if needed. With a little care, you can help keep their paws happy and get them back to running and playing like usual.