Updated September 25, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Quick answer: Dogs with lifelong allergies often continue to need care as they age. But new itching in an older dog is less likely to be a new allergy and more likely to have another cause, such as skin infections, hormone disorders like hypothyroidism or Cushing’s disease, parasites, or, rarely, skin cancer such as cutaneous lymphoma. A vet visit is important for itching that starts in a senior dog.
Causes of itching in senior dogs
- Ongoing environmental or food allergies
- Bacterial or yeast skin infections
- Hypothyroidism and Cushing’s disease, which make infections more likely
- Fleas and mites
- Dry skin
- Cutaneous lymphoma (less common), causing red, scaly, itchy skin
What your vet may do
- Skin scrapings and cytology
- Bloodwork, including thyroid and adrenal tests
- Skin biopsy for unusual lesions
Treating seniors
- Anti-itch medications are chosen with other health conditions in mind
- Regular bathing and skin-barrier care
- Omega-3 fatty acids
- Flea prevention
Sources
- Olivry T, et al. Treatment of canine atopic dermatitis: 2015 updated guidelines from the International Committee on Allergic Diseases of Animals (ICADA). BMC Vet Res. 2015
- Merck Veterinary Manual: Atopic dermatitis in dogs
- Merck Veterinary Manual: Flea allergy dermatitis
- AAHA Senior Care Guidelines for Dogs and Cats. 2023
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.