# Polydactyly in Dogs: Extra Toes, Causes, and Treatment Polydactyly in dogs means a dog is born with one or more extra toes. Most cases are harmless and need no treatment, but some extra toes cause walking problems or nail injuries that require surgery. Your veterinarian can tell you which type your puppy has. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Polydactyly is a congenital trait, meaning the puppy is born with it. It is not an injury or an infection. - Extra toes on the hind legs are the most common form in dogs and often cause no problems at all. - Surgery is only needed when the extra toe causes lameness, gets caught on things, or has a nail that keeps tearing. - Most polydactyl dogs live normal, active lives with routine nail care and paw checks. - Bring your puppy to a veterinarian for an exam and X-rays if the paw looks twisted, if your puppy limps, or if a nail keeps bleeding. ## What Is Polydactyly in Dogs? Polydactyly is the medical term for having more than the normal number of toes. A standard dog paw has four weight-bearing toes plus a dewclaw on the front legs. Some dogs also have rear dewclaws. When a puppy has extra digits beyond that normal pattern, it is called polydactyly. The extra toes usually appear on the inner (medial) side of the paw. In dogs, the most common form is preaxial polydactyly of the hind limb, which restores a digit that dogs lost during their evolution [1]. In plain words, the puppy grows a toe that its ancestors no longer had. Polydactyly is a developmental trait, not a disease you can catch. It happens while the puppy is forming in the womb. The same trait appears in cats, horses, and people, and in all of these species it traces back to how the limb bud develops early in pregnancy [1][2][3]. ## What Owners Notice First Most owners spot the extra toe within the first few days or weeks after birth. You may see: - An extra toe or toes on one or more paws, often on the inside edge - A wider or flatter looking paw - An extra nail that curves inward toward the pad - A toe that seems to dangle or wiggle loosely - A puppy that walks a little differently on that leg Some puppies have only one extra toe. Others have several. The number and shape can vary a lot even within the same litter. In a study of polydactyl cats, the trait affected not only the number and shape of the digits but also the structure of the wrist and ankle joints [4]. Dogs can show similar variation, so the whole paw and leg may look a bit different, not just the toe count. ## Causes and Risk Factors Polydactyly is genetic. It runs in families and in certain breeds. Researchers have linked canine preaxial polydactyly to changes in a gene called LMBR1 on chromosome 16 [1]. The specific DNA changes differ between Asian and Western breeds, which means the trait arose more than once [1]. Key points about the cause: - It is inherited, so a puppy is born with it. - It can be passed from either parent. - Some forms follow a dominant pattern, meaning one copy of the changed gene is enough [3]. - Environmental factors during pregnancy, such as certain viruses, medications, or radiation, can also damage genes and lead to developmental problems in puppies [5]. Polydactyly can also appear alongside other limb malformations. One case report described a dog with ectrodactyly (missing or split bones) combined with polydactyly, which caused lameness and needed surgery [6]. This is uncommon, but it shows why a full exam matters. If you are tracking your puppy's overall development, our guide to [dog hair loss after puppies](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/dog-hair-loss-after-puppies) covers another common postpartum concern. ## How Veterinarians Diagnose Polydactyly Diagnosis starts with a physical exam. Your veterinarian will count the toes, check how they attach, and watch your puppy walk. They will also feel the paw for swelling, pain, or a loose joint. X-rays are the next step when the extra toe looks abnormal or your puppy limps. Radiographs show whether the extra digit has its own bones and joint, or whether it is just a skin tag with a nail. They also reveal problems in the metacarpal or metatarsal bones underneath [6]. Your veterinarian may also check the other limbs, the spine, and the heart. Some congenital problems affect more than one body system, so a full nose-to-tail exam helps rule out other issues [5]. ### Questions Your Vet May Ask - When did you first notice the extra toe? - Has your puppy ever limped or favored that leg? - Has the nail caught on anything or bled? - Do the parents or littermates have extra toes? - Is your puppy eating, playing, and growing normally? ## Treatment Options for Polydactyly in Dogs Treatment depends on whether the extra toe causes problems. Many polydactyl dogs need no treatment at all. ### When No Treatment Is Needed If the extra toe is well formed, sits flat, and does not bother your dog, you can leave it alone. Keep the nail trimmed short so it does not curl into the pad. Check the paw weekly for redness, swelling, or cuts. ### When Surgery Is Recommended Surgery is an option when the extra toe: - Causes lameness or an abnormal gait - Has a nail that keeps tearing or snagging - Curls into the pad and causes pain or infection - Is attached loosely and at risk of catching on objects - Is part of a larger limb deformity that affects walking The surgical plan depends on what the X-rays show. In one reported case, surgeons removed the extra bone and soft tissue to prevent further slipping of the remaining paw bones, then stabilized the area with a screw and a pin [6]. That is a complex procedure for a complex deformity. A simple extra toe with its own small bones is usually removed with a much smaller surgery. Your veterinarian will calculate any medication doses based on your dog's weight and health. Never give human pain relievers to a dog without veterinary guidance. ### What About the Nail? Sometimes the only problem is the nail. If the extra toe stays but the nail keeps causing trouble, your vet may recommend removing just the nail or trimming and reshaping it regularly. A nail that curls into the pad can cause a painful infection, similar to the problems described in our article on [dog nail infection](/knowledge/veterinary-medicine/preventive-care/nail-infection-in-dogs). ## Comparing Common Scenarios | Scenario | Typical Sign | Usual Approach | |---|---|---| | Extra toe, well formed, no pain | None | Monitor, trim nails, no surgery | | Extra toe with loose attachment | Toe wiggles, catches on things | Consider removal | | Extra toe with curled nail | Nail digs into pad, bleeding | Trim or remove nail, treat infection | | Extra toe with limb deformity | Limping, twisted paw | X-rays, possible complex surgery [6] | ## Recovery, Outlook, and Long-Term Management Recovery after simple toe removal is usually quick. Most dogs go home the same day and need rest, a bandage, and a cone to protect the incision. Your vet will give you a recheck schedule. Recovery after complex limb surgery takes longer. In the case report, the dog showed improved limb function and weight bearing at six weeks, had a complication at twelve weeks that required a second surgery, and by six months had near normal range of motion with no lameness [6]. That timeline shows that even complicated cases can end well with careful follow-up. Long-term care for any polydactyl dog includes: - Trimming all nails, including the extra ones, every few weeks - Checking the paw pads and the spaces between toes - Watching for limping, licking, or swelling - Keeping your dog at a healthy weight to reduce joint stress - Mentioning the trait to your vet at every exam If your dog also has other skin or eye issues, our articles on [cherry eye in dogs](/knowledge/veterinary-medicine/symptom-guides/cherry-eye-in-dogs) and [dog hair loss on the tail](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/dog-hair-loss-tail) cover those topics. ## Can Polydactyly Be Prevented? You cannot prevent polydactyly in a puppy that is already conceived, because the trait is written into the genes [1]. What you can do is make informed breeding choices. - If a dog has polydactyly, talk to your veterinarian before breeding it. - Ask breeders whether extra toes run in their lines. - Understand that some forms are dominant, so one affected parent can pass the trait on [3]. - Avoid breeding dogs with limb deformities that cause lameness. For most pet owners, prevention is not the main concern. Care and monitoring are. ## Limitations and When to Contact a Veterinarian This article gives general information. Your dog's case needs a veterinarian who can examine the paw and see the X-rays. Contact your veterinarian the same day if you notice: - A nail that is bleeding and will not stop - Swelling, heat, or discharge around the extra toe - Your dog licking or chewing at the paw constantly - A sudden limp or refusal to put weight on the leg Go to an emergency clinic right away if: - Your dog cannot walk at all - The paw is bent at an odd angle after a fall or injury - There is heavy bleeding - Your dog is crying in pain or panting heavily Schedule a routine visit if: - You just noticed an extra toe on your puppy - The extra toe has never been checked by a vet - The nail keeps growing into the pad - You are considering surgery and want to discuss options ## Frequently Asked Questions ### Is polydactyly painful for dogs? Most extra toes do not cause pain. Pain happens when the toe is loose, when the nail curls into the pad, or when a limb deformity changes how your dog walks. If your dog limps or licks the paw, have it checked. ### Will my puppy grow out of having extra toes? No. Polydactyly is present at birth and does not go away as the puppy grows. The toe may look different as the paw gets bigger, but the extra digit stays unless it is removed surgically. ### Does having extra toes affect my dog's ability to walk? Many polydactyl dogs walk normally. Problems show up when the extra toe interferes with the paw's shape or when it pairs with other bone deformities. A veterinarian can assess your dog's gait and decide whether treatment is needed. ### Should I remove the extra toe just to be safe? Not always. Removal is recommended when the toe causes pain, lameness, or repeated nail injuries. A well-formed toe that sits flat and does not bother your dog can often stay. Discuss the risks and benefits with your vet. ### Can I trim the extra nail at home? Yes, if your dog tolerates nail trims. Use proper clippers and take off small amounts at a time. The extra nail can be thicker or curved, so ask your vet or groomer to show you the technique first. Stop if you see bleeding and apply styptic powder. ## Related Articles - [Dog Hair Loss After Puppies: Causes and What to Do](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/dog-hair-loss-after-puppies) - [Cherry Eye in Dogs: Causes, Surgery Options, and Recovery](/knowledge/veterinary-medicine/symptom-guides/cherry-eye-in-dogs) - [Lateral Saphenous Venipuncture in Dogs: Technique and Troubleshooting](/knowledge/veterinary-medicine/clinical-skills-training/lateral-saphenous-venipuncture-dogs-technique-troubleshooting) - [Dog Nail Infection: Signs, Causes, and Treatment](/knowledge/veterinary-medicine/preventive-care/nail-infection-in-dogs) - [Dog Hair Loss on Tail: Causes and Treatment](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/dog-hair-loss-tail) - [Comprehensive Guide to Head Shaking in Dogs: Causes, Diagnostics, and Treatment](/knowledge/veterinary-medicine/symptom-guides/dog-head-shaking-master-guide) ## References 1. [Canine polydactyl mutations with heterogeneous origin in the conserved intronic sequence of LMBR1](https://pubmed.ncbi.nlm.nih.gov/18689889/). Genetics, 2008. 2. [Inherited non-syndromic polydactyly in a Berber and Arabian-Berber horse family](https://pubmed.ncbi.nlm.nih.gov/39853805/). Equine veterinary journal, 2025. 3. [A novel ZRS mutation in a Balochi tribal family with triphalangeal thumb, pre-axial polydactyly, post-axial polydactyly, and syndactyly](https://pubmed.ncbi.nlm.nih.gov/22786669/). American journal of medical genetics. Part A, 2012. 4. [Clinical characterisation of polydactyly in Maine Coon cats](https://pubmed.ncbi.nlm.nih.gov/26862149/). Journal of feline medicine and surgery, 2017. 5. [Congenital and Inherited Disorders Affecting Multiple Body Systems of Dogs - Dog Owners](https://www.merckvetmanual.com/dog-owners/disorders-affecting-multiple-body-systems-of-dogs/congenital-and-inherited-disorders-affecting-multiple-body-systems-of-dogs). Merck Veterinary Manual. 6. [Ectrodactyly with Polydactyly in a Dog-Case Description and Description of Surgical Therapy with Resection and Fusion Podoplasty](https://pubmed.ncbi.nlm.nih.gov/38891696/). Animals : an open access journal from MDPI, 2024. ## Further Reading - [Merck Veterinary Manual: Dog Owners](https://www.merckvetmanual.com/dog-owners) - [Cornell Richard P. Riney Canine Health Center: Canine Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)