Bump Between Your Dog's Toes: Causes and When to Worry
By Dr. Zubair Khalid, DVM, MS, PhD ·
A dog bump in between toes is usually an interdigital cyst, a painful swollen spot caused by infected hair follicles, bacteria, or yeast. Some lumps are foreign bodies, allergies, or rarely tumors. Most need a veterinarian to identify the cause and treat it properly.
This article is educational and is not a substitute for veterinary diagnosis or treatment.
Quick Answer
- A bump between the toes is most often an interdigital furuncle (also called an interdigital cyst), which is a deep infection of the hair follicles in the webbing [1].
- Breeds with short, bristly webbing hair or heavy webbing, such as Chinese Shar-Peis, Labrador Retrievers, and English Bulldogs, are predisposed [1].
- Yeast overgrowth with Malassezia pachydermatis commonly plays a role in pododermatitis, the broader term for inflamed paws [2].
- Licking, limping, swelling, redness, and a pus-filled or bleeding lump are common signs that need a veterinary exam.
- Do not squeeze, lance, or apply human acne products to the bump. Keep the paw clean and dry, and prevent licking until you see your vet.
What a Bump Between the Toes Looks Like
A bump between your dog's toes can be small and firm or large, red, and oozing. It may sit in the webbing, on the top of the toe, or along the side of a digit. Some dogs have one lump. Others have several paws affected at once.
You may notice your dog licking the paw constantly. The paw might look puffy, and the skin between the toes can be red or darkened. Sometimes the lump drains pus or blood. Your dog may limp or refuse to let you touch the foot.
The medical term for this general problem is pododermatitis, which means inflammation of the skin of the paw. An interdigital furuncle is a specific type of deep infection that looks like a severely infected pimple or boil [1]. It forms in the webbing between the toes and is often very painful [1].
What Is Normal
Normal webbing between the toes is smooth, flat, and the same color as nearby skin. There should be no swelling, no discharge, and no odor. Your dog should walk and run without favoring a paw. Mild seasonal redness can happen after a long walk on hot pavement or through tall grass, but it should settle within a day.
Main Causes of a Dog Bump in Between Toes
Several conditions can produce a lump between the toes. The table below lists the most common causes and how urgent each one tends to be.
| Cause | Typical clues | How urgent |
|---|---|---|
| Interdigital furuncle (interdigital cyst) | Painful pus-filled swelling in the webbing, licking, limping, often recurrent | See a vet within a few days |
| Bacterial infection (pyoderma) | Redness, pus, crusting, odor, swelling of the paw | See a vet within a few days |
| Yeast overgrowth (Malassezia) | Greasy, musty-smelling skin, brown discharge, chronic licking | Routine visit |
| Foreign body (foxtail, burr, splinter, grass awn) | Sudden swelling, a visible wound, intense licking, sometimes a draining tract | Same day if the object is embedded or the paw is very swollen |
| Allergy or contact irritation | Itchy paws, redness, often seasonal or after floor or grass exposure | Routine visit |
| Epidermoid cyst | Firm, slow-growing lump, sometimes involving bone in rare cases | Routine visit with imaging |
| Tumor (benign or malignant) | Firm lump that does not respond to treatment, may involve the bone | Prompt evaluation |
Interdigital Furuncles and Infection
The most common cause of furuncles between the toes is a deep bacterial infection [1]. The short hair shafts on the webbing can be pushed backward into the hair follicles while your dog walks. These ingrown hairs cause intense inflammation, and secondary bacterial infections follow [1]. Less often, a hair shaft becomes infected after foreign material such as a splinter or burr gets embedded in the skin [1].
Some breeds are built in a way that makes this more likely. Chinese Shar-Peis, Labrador Retrievers, and English Bulldogs have short, bristly hairs on the webbing or prominent amounts of webbing, which raises their risk [1].
Yeast and Malassezia
Malassezia pachydermatis is a yeast that normally lives on dog skin. Under certain conditions it overgrows and acts as an opportunistic pathogen, causing dermatitis and ear infections [2]. In canine pododermatitis, this yeast is a common secondary player [2]. Dogs with pododermatitis tend to have higher Malassezia cell counts and colony-forming units in the interdigital space than healthy dogs [2]. A musty smell and greasy brown debris between the toes are clues.
Foreign Bodies
Grass awns, foxtails, burrs, and splinters can lodge between the toes. The body reacts with swelling and pus, and the lump may appear suddenly after a walk in tall grass or brush. A draining tract (a small opening that leaks fluid) sometimes forms. Foreign bodies need removal, and a deep one may require sedation or anesthesia.
Allergies and Environment
Allergic skin disease often shows up as itchy paws. Dogs lick and chew the webbing, which damages the skin and invites infection. Flooring and moisture matter too. In a study of dogs housed in commercial breeding facilities, wet paws were associated with pododermatitis and related paw abnormalities, and matted paw fur was more common with increasing age [3]. Keeping paws dry and trimmed helps reduce that risk.
Cysts and Tumors
Not every lump is an infection. Epidermoid cysts are non-neoplastic lesions lined by keratinizing epithelium and filled with keratin [4]. The dermal form is common in dogs, but the intraosseous form (inside the bone) is rarely reported [4]. These cysts must be distinguished from other digital lesions involving bone, especially malignant tumors, because tumors often need more extensive surgery [4].
Lumps that do not improve with treatment, grow steadily, or involve the bone deserve imaging and possibly a biopsy. A veterinarian may use radiography, ultrasonography, or advanced imaging such as CT or MRI when the cause is unclear [5].
Red Flags That Make It an Emergency
Most toe bumps can wait a day or two for an appointment. Some signs mean you should seek care right away.
- The paw is suddenly very swollen, hot, and painful, and your dog will not bear weight.
- The lump is bleeding heavily or will not stop oozing.
- You see a deep wound, a foreign object stuck in the paw, or exposed tissue.
- Your dog has a fever, is lethargic, or is not eating.
- The swelling spreads up the leg.
- Your dog is crying, panting, or biting at the paw nonstop.
These signs can point to a deep infection, an embedded foreign body, or another serious problem. Delayed diagnosis can affect prognosis and treatment options for some limb conditions [5].
Safe Home Care While You Wait for the Vet
You can make your dog more comfortable without risking harm. These steps do not replace a diagnosis.
Keep the Paw Clean and Dry
Rinse the paw with plain lukewarm water after outdoor walks. Pat it dry, including between the toes. Moisture feeds yeast and bacteria, and wet paws were linked to paw abnormalities in one facility study [3].
Stop the Licking
Licking keeps the skin wet and pushes bacteria deeper. An Elizabethan collar or a soft cone is the simplest way to block access. A clean sock or bootie can help indoors, but change it if it gets damp.
Trim Hair Carefully
If the hair between the toes is long and matted, gentle trimming with blunt-tipped scissors can reduce moisture trapping. Do not cut close to the skin. Matted paw fur was more common in older dogs in one study, so check senior paws regularly [3].
Do Not Squeeze or Lance the Bump
Squeezing can push infection deeper and cause more pain. Do not use human acne creams, hydrogen peroxide, or alcohol on the paw. Your veterinarian will choose the right treatment.
Use Only Vet-Approved Products
If your veterinarian has already prescribed a paw soak, medicated wipe, or topical product for your dog, follow those instructions. Otherwise, stick to water and drying. Never give human pain medications. Many are toxic to dogs, and the dose for any pet medication is calculated by your veterinarian based on your dog's weight and health.
If your dog is also coughing, vomiting, or showing other symptoms, see our guides on Dog Coughing: When Should You Worry? and Dog Vomiting: When Should You Worry?.
What Your Veterinarian Will Check and Test
Your veterinarian will start with a full history. They will ask when the bump appeared, whether your dog limps, how much licking happens, and what surfaces your dog walks on. Then they will examine all four paws, not just the sore one.
Physical and Paw Exam
The vet will look for swelling, redness, discharge, odor, wounds, and foreign material. They will check the nails, the pads, and the spaces between every toe. They may press gently to see if pus drains and to locate the source of pain.
Skin Testing
Cytology is common. A sample of the discharge or skin surface is examined under a microscope to look for bacteria and yeast such as Malassezia [2]. This helps guide treatment. In one study, pododermatitis samples before treatment had higher yeast cell counts and colony-forming units than samples from healthy dogs [2].
Foreign Body and Imaging Checks
If a foreign body is suspected, the vet may probe the tract or use imaging. Radiography and ultrasonography are standard first steps for limb lameness, and CT, MRI, or other advanced imaging may be used in complex or unresolved cases [5]. Imaging also helps tell cysts and infections apart from tumors involving bone [4].
Biopsy
If the lump does not respond to treatment or looks unusual, the vet may take a small tissue sample. This is the reliable way to identify tumors, cysts, and other growths. Epidermoid cysts must be differentiated from malignant digital lesions, which may need more extensive surgery [4].
Treatment Basics
Treatment depends on the cause. Bacterial infections usually need antibiotics, and yeast overgrowth needs antifungal therapy [1][2]. Foreign bodies need removal. Allergies need long-term management. Your veterinarian will set the exact medication and dose for your dog.
Prevention and Monitoring
You cannot prevent every toe bump, but you can lower the odds and catch problems early.
Dry the Paws
Dry your dog's feet after every walk, bath, or swim. Pay attention to the webbing. Wet paws were associated with paw abnormalities in a study of dogs in commercial breeding kennels, so moisture control is a reasonable habit at home too [3].
Check the Paws Weekly
Look between every toe once a week. Early redness or a small lump is easier to treat than a deep infection. Senior dogs and dogs with matted fur need closer checks [3].
Manage Allergies
If your dog has atopic dermatitis or food allergies, follow your vet's plan. Chronic pododermatitis often has an allergic trigger underneath. Uncontrolled allergies lead to repeated licking and repeated infections.
Keep Nails and Hair Trimmed
Long nails change how your dog stands and can push toes out of alignment. Long webbing hair traps moisture. Ask your vet or groomer how short to keep both.
Know Your Dog's Risk
Breeds with short, bristly webbing hair or heavy webbing are more prone to interdigital furuncles [1]. If your dog is one of them, check the paws more often and act quickly when you see licking.
If your dog also has skin problems elsewhere, our article on Dog Skin Rash: When to Worry and How to Soothe covers related care. Hair loss on the nose can be another sign of skin disease, discussed in Dog Hair Loss on Nose: Causes and When to Worry.
Limitations and When to Contact a Veterinarian
This article cannot tell you what your dog's specific lump is. Only a veterinarian can examine the tissue, run tests, and make a diagnosis. Individual cases need a veterinarian, and home care is only a bridge until that visit.
Contact your veterinarian the same day if your dog is limping badly, the paw is very swollen, or you see pus or blood. Go to an emergency clinic now if your dog cannot bear weight, has a fever, is lethargic, has a deep wound, or has a foreign object stuck in the paw. A rapidly spreading swelling or nonstop bleeding also needs emergency care.
Schedule a routine visit if the bump is small, your dog is comfortable, and there is no open wound. Even then, do not wait more than a few days. A lump that does not improve, keeps coming back, or grows should be evaluated. Recurrent interdigital furuncles often signal an underlying allergy or deep infection that needs a full treatment plan [1][2].
Frequently Asked Questions
Can I pop a bump between my dog's toes?
No. Popping or squeezing the lump can push infection deeper and cause severe pain. It can also turn a contained problem into a spreading one. Let your veterinarian decide whether the lump needs to be drained or treated with medication.
Is an interdigital cyst the same as a tumor?
No. An interdigital cyst is an infected, pus-filled swelling linked to hair follicles and bacteria [1]. A tumor is a growth of abnormal tissue. The two can look similar on the surface, which is why a lump that does not respond to treatment should be sampled.
Why does my dog keep getting bumps between the toes?
Repeated bumps often mean an underlying problem is not controlled. Allergies, yeast overgrowth, and deep bacterial infection are common drivers [1][2]. Some breeds are predisposed because of their webbing and hair type [1]. Your vet will look for the root cause.
Should I soak my dog's paw in Epsom salt?
Ask your veterinarian first. Some vets recommend medicated soaks for certain paw conditions, but the right product and timing depend on the diagnosis. Plain water and thorough drying are safe basics while you wait for your appointment.
Can a foreign object cause a lump between the toes?
Yes. Splinters, burrs, and grass awns can embed in the webbing and cause swelling, pain, and drainage [1]. If you see a wound or a visible object, or if the swelling came on suddenly after a walk, see your vet the same day.
Related Articles
- Dog Coughing: When Should You Worry?
- Dog Hair Loss on Nose: Causes and When to Worry
- Dog Vomiting: When Should You Worry?
- Dog Separation Anxiety Peeing
- Dog Skin Rash: When to Worry and How to Soothe
- Dog Separation Anxiety in Puppies: Early Signs and Prevention
- Dog Paw Raw Between Toes: Causes and Treatment
- Bump on Your Dog's Paw or Paw Pad: Causes and Care
- Bump on Your Dog's Leg or Foot: Causes and When to Worry
References
- Abscesses Between the Toes (Interdigital Furunculosis) in Dogs - Dog Owners. Merck Veterinary Manual.
- Study of the variation of the Malassezia load in the interdigital fold of dogs with pododermatitis. Veterinary research communications, 2023.
- A cross-sectional study to investigate associations between flooring substrates and prevalence of limb and paw abnormalities of dogs housed in commercial breeding facilities. Frontiers in veterinary science, 2025.
- Intraosseous epidermoid cyst in the digit of an atopic dog with chronic pododermatitis: case report. Brazilian journal of veterinary medicine, 2026.
- Diagnosing Thoracic Limb Lameness in Dogs. The Veterinary clinics of North America. Small animal practice, 2026.