What Is Zinc-Responsive Dermatosis?
Zinc-responsive dermatosis is a skin condition caused by a lack of usable zinc in the body. Zinc is needed for healthy skin cells, coat growth and wound healing. When a dog cannot absorb or get enough of it, thick crusts and scales build up, mostly on the face, ears and feet. It is rare in cats.
Two main types
Type 1 is inherited and seen mainly in Siberian Huskies and Alaskan Malamutes, which absorb zinc poorly even on a good diet. Type 2 affects fast-growing puppies fed poorly balanced diets or too much calcium.
Breeds at Risk
- Northern breeds: Siberian Huskies, Alaskan Malamutes and Samoyeds (Type 1)
- Fast-growing large-breed puppies: such as Great Danes, Dobermans and German Shepherds (Type 2)
- Dogs on unbalanced homemade diets or high-cereal, high-calcium foods
Signs to Watch For
- Thick crusts, scales and hair loss around the eyes, lips, chin and ears
- Cracked, thickened footpads; compare with paw hyperkeratosis
- Crusts over pressure points such as elbows
- Dull coat and flaky skin; see dog dandruff
- Itching and secondary skin infections in some dogs
Diagnosis
Vets look at the breed, diet and pattern of lesions. Skin scrapings and cytology rule out mites and infection, and a skin biopsy confirms the typical changes. Blood zinc tests are not very reliable, so a good response to zinc supplements is often part of the diagnosis.
Treatment
- Zinc supplements: zinc methionine, gluconate or sulfate given with food; Type 1 dogs often need it for life
- Diet correction: a complete, balanced commercial diet for Type 2 puppies, without extra calcium
- Skin care: medicated baths to soften crusts; see dog shampoo guide
- Treating infection: antibiotics or antifungals if secondary infection is present
- Low-dose steroids: sometimes used short term to help zinc absorption in resistant cases
Do not overdose
Too much zinc is toxic and can cause vomiting and anemia. Only give zinc at the dose your vet prescribes, and do not combine it with other zinc-containing supplements without asking.
Outlook
Puppies with diet-related Type 2 usually recover fully once the diet is fixed. Type 1 dogs do well on lifelong supplements but may flare during stress, heat cycles or illness.
Frequently Asked Questions
How fast does zinc treatment work?
Many dogs improve within 4 to 6 weeks of starting supplements.
Can cats get zinc-responsive dermatosis?
It is very rare in cats.
Is it contagious?
No. It is a nutritional and genetic condition, not an infection.
Seeing crusts around your dog’s eyes, mouth or paws? Find a veterinary clinic near you for an exam.