Maine Coon Polydactyly: Check and Care

JointBreed HealthMeongsiljang Veterinary Advisory Board

We’ve compiled everything cat owners need to know about Maine Coon polydactyly, from its definition and genetic causes to paw and nail care tips, as well as warning signs that warrant a vet visit.

What is Maine Coon Polydactyly?

Close-up of a Maine Coon cat's front paw, showing its six toes

Polydactyly in Maine Coons is a genetic trait that causes them to be born with more toes than the typical five on each front paw and four on each hind paw. The most important thing to understand is that polydactyly itself is not a disease, but rather a normal variation. However, extra toes can sometimes lead to ingrown nails or affect walking balance, so it’s essential for owners to regularly monitor both the shape of their cat’s paws and their gait.

Why Does It Occur Frequently in Maine Coons?

Polydactyly in Maine Coons is a hereditary trait caused by a genetic mutation affecting the number of toes. Veterinary textbooks note that this condition, which manifests as a deformity in the number of toes, is inherited in an autosomal dominant pattern with varying degrees of expression among individuals. Therefore, if only one parent carries this trait, it can be passed on to their offspring. While it is said that polydactyly was relatively common in early Maine Coon bloodlines, the exact prevalence is difficult to confirm, and some breed associations currently classify it as a non-standard trait. However, polydactyly itself has not been reported as a condition that directly harms health, so rather than focusing on statistics or labels, it is more important to regularly monitor your cat's paw condition.

Types of Polydactyly and Checking Your Cat’s Paw Shape

Polydactyly is categorized into two types based on where the extra toes are located. Here are the key points for owners to check. Pre-axial polydactyly (thumb-side): This is the most common type, with one or two extra toes on the thumb side, similar to a human hand. It usually doesn't cause significant functional issues. Post-axial polydactyly (pinky-side): This occurs when an extra toe develops on the outer side of the pinky toe, and it is less common. Mitten paw: This condition resembles a human hand with the thumb-like toe appearing split. Nail care can be more challenging in this case.

A top-down view of both front paws of a Maine Coon cat

When to Visit the Vet: Warning Signs

Polydactyly itself is not an emergency, but complications arising from the extra toes require prompt evaluation. Seek immediate veterinary care if your pet constantly licks between its toes, limps, shows redness and swelling with discharge between the toes, or has ingrown nails. In particular, because the nails on extra toes do not contact the ground and therefore cannot wear down naturally, they frequently curl inward.

Key Points for Nail and Interdigital Care

For polydactyl Maine Coons, it’s best to trim their nails more frequently than for regular cats.

Nail check schedule: Inspect all toes every 2–3 weeks to check nail length.

Check extra toes first: Nails on toes that don’t touch the ground won’t wear down naturally and tend to grow the longest.

Groom fur between toes: The long fur characteristic of Maine Coons can mat between the toes, creating a moist environment where bacteria can accumulate.

Inspect paw pads: Extra toes are more prone to matting, so gently comb them out with your fingers each time.

Don’t Forget Joint and Body Condition Management

Maine Coons are a large breed, typically weighing between 4 and 8 kg, which places significant stress on their joints. While polydactyly itself does not cause joint disease, the extra toes can subtly affect gait, making it important to manage both weight and joint health together. Maintain an ideal body weight, lower the steps on cat trees, and consult your veterinarian about joint-supporting supplements such as glucosamine and omega-3 fatty acids.

A Maine Coon cat walking across the living room floor.

Genetic Conditions Maine Coon Owners Should Also Monitor

There is a genetic condition that Maine Coons need to watch out for more than polydactyly itself. Hypertrophic cardiomyopathy (HCM) is the most common myocardial disease in cats, and it has been reported to be strongly associated with the MYBPC3 gene A31P mutation in Maine Coons. However, this mutation is only found in about 34–40% of Maine Coon HCM cases, and cats with only one copy of the mutation have a low risk of developing the disease before 4–5 years of age, so it is difficult to feel completely reassured or make a definitive judgment based on a single test result. Although it is not directly related to polydactyly, Maine Coon owners are advised to consider both genetic testing and annual cardiac ultrasound examinations, as recommended in veterinary guidelines. Regular cardiac evaluations are especially recommended for breeding cats or those in high-risk groups.

At-Home Paw Inspection Routine

The best way to keep your polydactyl Maine Coon’s paws healthy is to perform frequent, quick checks.

Step 1: Gently spread the toes: Lightly press the top of the paw to gently fan out the toes.

Step 2: Check nail length: Look for nails that are curling toward the skin or piercing the paw pads.

Step 3: Check color and odor: If the spaces between the toes appear redder than usual or emit a foul smell, there may be an infection.

Step 4: Observe gait: Monitor your cat for several days to see if they are lifting one paw or limping differently than usual.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Do Maine Coons with polydactyly need surgery to remove the extra toes?

We don’t perform surgery simply because a pet has extra toes. Partial amputation is only considered under veterinary guidance if the nails are growing into the flesh, causing chronic infections, or resulting in severe gait abnormalities.

Do Maine Coons with polydactyly face any issues in cat shows or when being rehomed?

Standards vary among breed registries. While some classify polydactyly as a non-standard trait, others recognize the "Polydactyl Maine Coon" as a distinct category. Be sure to verify the specific registry's regulations before purchasing a kitten.

I adopted a polydactyl cat. Will its kittens also be polydactyl?

Polydactyly is an autosomal dominant trait, meaning that if just one parent carries the gene, there’s about a 50% chance it will be passed on to their offspring. While it’s not guaranteed, the likelihood is still quite high.

Are there any precautions to keep in mind when using nail clippers on a polydactyl paw?

The nails on dewclaws often vary in thickness and curvature. Instead of trimming them all at once, clip small amounts from the tips to avoid injuring the quick (the living blood vessel inside the nail). If you find this difficult, it’s safest to have them regularly trimmed at a veterinary clinic.

Is there a connection between polydactyly and arthritis?

No direct causal link has been reported. However, since Maine Coons are a large-breed cat that naturally places significant stress on their joints, it’s important to manage their weight and support joint health regardless of whether they have polydactyly.