Dogs get skin tags primarily because of friction, aging, and genetics. These small, fleshy growths (technically called acrochordons) are benign overgrowths of skin cells that form when collagen fibers and blood vessels get trapped inside thickened patches of skin. They’re one of the most common skin growths in dogs, and in the vast majority of cases, they’re completely harmless.
What Causes Skin Tags in Dogs
The most consistent trigger is repeated friction or rubbing against the skin. Anywhere your dog’s body rubs against itself, against the ground, or against gear like collars and harnesses creates the kind of chronic low-level irritation that can prompt skin cells to overgrow. This is why skin tags so often appear in skin folds, on the belly, or right under the collar line.
Age plays a major role. As dogs get older, their skin loses elasticity and becomes more prone to these small overgrowths. A dog that had smooth skin at two years old may start developing tags by age seven or eight. This mirrors what happens in humans, where skin tags become increasingly common after middle age.
Genetics also matter. Boxers, hound breeds, bully-type terriers, English Bulldogs, and Pugs are all more prone to developing skin tags. Breeds with loose, wrinkly skin have more skin-on-skin contact, which creates more friction and more opportunity for tags to form. That said, any breed can develop them.
Where Skin Tags Typically Appear
Skin tags can show up anywhere on your dog’s body, but certain spots are far more common than others. These locations all share one thing: movement or pressure against the skin.
- Neck and collar area: Constant collar friction makes this one of the most frequent sites.
- Under the legs and belly: These areas rub when your dog walks, runs, or lies down.
- Around the mouth and eyes: Less common, but skin tags do appear on the face.
- Between the toes: Frequent movement in tight spaces between the digits creates ideal conditions.
If your dog has one skin tag, there’s a reasonable chance more will appear over time, particularly in the same friction-prone zones.
Skin Tags vs. Growths That Need Attention
A typical skin tag is small, soft, and the same color as the surrounding skin (or slightly darker). It usually hangs off the body on a thin stalk, feels pliable when you touch it, and doesn’t bother your dog at all. It won’t change much after it forms.
Not every lump on your dog is a skin tag, though, and the difference matters. Skin tumors in dogs are extremely diverse in appearance. They can look like small bumps, hairless discolored patches, raised ulcerated areas, or lumps deep within the skin. Some malignant growths, like certain vascular tumors, grow rapidly and destroy nearby healthy tissue. Others may break through the skin surface, cause tissue death, or drain fluid.
Because the range of possible skin growths is so wide, visual identification alone isn’t reliable. A growth that deserves a closer look is one that changes noticeably in size over weeks, shifts in color, bleeds or oozes without being scratched, feels firm or fixed to deeper tissue, or seems to cause your dog pain. A veterinarian can determine whether a biopsy is needed, which is the only definitive way to rule out something more serious.
Do Skin Tags Need to Be Removed?
Most skin tags don’t need any treatment. They’re cosmetic, not medical. Your dog doesn’t notice them, and they pose no health risk on their own.
Removal makes sense in a few specific situations. If a skin tag is in a spot where it gets snagged, scratched, or irritated repeatedly (caught on a collar, for instance), it can bleed or become infected. Tags near the mouth might get chewed on. Tags between the toes can accumulate moisture and debris. In these cases, a vet can remove the growth quickly, usually with a minor procedure that involves local anesthesia and takes just minutes.
You should never try to cut, tie off, or freeze a skin tag at home. What looks like a harmless tag could be a different type of growth entirely, and at-home removal carries real risks of infection, bleeding, and pain. It also eliminates the chance to send the tissue for analysis.
Reducing Your Dog’s Risk
You can’t fully prevent skin tags, especially in predisposed breeds or aging dogs, but you can reduce friction-related triggers. Make sure your dog’s collar fits properly without rubbing or bunching the skin. Keep skin folds clean and dry, particularly in breeds like Bulldogs and Pugs where moisture gets trapped. Maintaining a healthy weight helps too, since excess body fat creates more skin-on-skin contact.
Get in the habit of running your hands over your dog’s body regularly. You’ll notice new lumps early, and you’ll develop a mental map of what’s already there. Most of the time, a new bump will turn out to be a harmless skin tag. But catching the rare exception early makes all the difference.