Hereditary Footpad Hyperkeratosis in Dogs: Causes & Care
Hereditary Footpad Hyperkeratosis (HFH) is an inherited condition that causes the thickening and hardening of the skin on dogs' paw pads, leading to painful cracks, sores, and sometimes infections. This autosomal recessive genetic disorder primarily affects breeds such as the Irish terrier puppies, Kromfohrlander puppies, and Dogue de Bordeaux puppies.
Understanding Hereditary Footpad Hyperkeratosis
HFH occurs due to a mutation in genes such as KRT16, causing abnormal production of keratin, the protein responsible for skin strength and protection. This results in excessive, thick, and hard skin on all four paw pads, which cracks and becomes painful, severely affecting the dog's quality of life.
Affected dogs may display rough, crusty footpads with deep fissures that make walking uncomfortable or painful. The claws may also grow abnormally fast and become brittle or misshapen. In some cases, hyperkeratosis can appear on the nose or other pressure points, leading to dryness and crusting.
How HFH is Inherited
HFH is inherited as an autosomal recessive condition. This means a dog must inherit two copies of the mutated gene (one from each parent) to be affected. Dogs are classified into three statuses:
- Clear: No copies of the mutation; will not develop nor pass on the condition.
- Carrier: One copy of the mutation; healthy but can pass the gene to offspring.
- Affected: Two copies of the mutation; will develop HFH.
The inheritance probabilities from different parental combinations are:
- Two clear dogs produce a clear litter.
- Two affected dogs produce an affected litter.
- Two carrier dogs produce ~25% affected, 50% carriers, and 25% clear puppies.
- A clear and a carrier produce 50% carriers and 50% clear puppies.
- A clear and an affected dog produce all carrier puppies.
- A carrier and an affected dog produce 50% affected and 50% carrier puppies.
Breeds at Risk
HFH is observed most commonly in Dogue de Bordeaux, Irish terriers, and Kromfohrlanders. Approximately 10% of Dogue de Bordeaux dogs may be carriers or affected. Crossbreeding involving these breeds may still carry a risk if two carrier or affected individuals are mated, so pedigree awareness and genetic testing are key.
Testing for HFH
Responsible breeders and owners of at-risk breeds are encouraged to use The Kennel Club's approved DNA testing to determine a dog's HFH status before breeding. Testing involves sending a cheek swab or blood sample to authorised laboratories for analysis.
Knowing the genetic status allows breeders to make informed decisions to avoid producing puppies with the condition, crucial for responsible ownership and ethical breeding practices.
Managing Dogs with HFH
Although there is no cure for HFH, careful management can greatly improve affected dogs’ comfort and quality of life.
- Regular Footpad Care: Soften and moisturise the pads frequently with appropriate veterinary-recommended creams to prevent thickening and cracking.
- Protective Measures: Avoid harsh surfaces and extreme temperatures which can exacerbate symptoms.
- Monitor for Infection: Regularly check for cracks or sores and seek veterinary care promptly when infections are detected, which may require antibiotics or antifungal treatments.
- Claw Care: Keep nails trimmed carefully to avoid splitting and discomfort from irregular growth.
- Pain Management: Consult with your vet to manage any pain and maintain mobility.
Why Responsible Breeding Matters
HFH is a genetically inherited condition, so the best prevention is to avoid breeding affected or carrier dogs. Genetic testing and breeding clear dogs ensure that HFH is not passed to future generations, improving breed health and reducing suffering.
Potential dog owners seeking puppies should look for reputable breeders who participate in health testing schemes, such as those supported by The Kennel Club, to help safeguard puppy health.
Conclusion
Hereditary Footpad Hyperkeratosis is a painful condition causing thickening and cracking of paw pads, predominantly in certain breeds. Understanding its genetic basis, testing for HFH, and managing symptoms with veterinary guidance can greatly improve affected dogs’ lives. Responsible breeding practices remain essential to prevent this condition from continuing to affect future generations.
