If your dog spends the evening chewing its paws or scratching its ears, allergies are one possibility, not a certainty. Fleas, infections, mites, contact irritation and other skin diseases can cause similar discomfort. Getting the cause right can spare your dog repeated flare-ups and unnecessary treatments.
When to contact a veterinarian
Arrange an examination when scratching persists, interrupts sleep, causes hair loss, or comes with red skin, a strong odor, oozing, sores or recurrent ear problems. Call promptly if a hot spot is spreading, the skin is painful or your dog seems generally unwell. Facial swelling, trouble breathing or collapse can signal an emergency and require immediate care.
Common causes of itching
- Flea allergy: a sensitive dog may react to bites even when you cannot see fleas.
- Environmental atopic dermatitis: often affects paws, face, ears, underarms or belly and can flare with allergens.
- Secondary infection: bacteria or yeast may worsen an allergic flare and need their own diagnosis.
- Food allergy: less common than many advertisements imply; it requires a proper dietary trial directed by a veterinarian.
- Other conditions: mites, ringworm and irritants can mimic allergies.
Why guessing at a treatment can backfire
Changing foods repeatedly, giving human antihistamines without veterinary advice or applying essential oils may delay diagnosis or cause harm. A veterinarian may examine skin and ears, check for parasites and take small samples to evaluate infection. The treatment plan may combine parasite control, infection management, medication for itch and follow-up.
According to the Merck Veterinary Manual’s overview of canine atopic dermatitis, flare-ups should prompt a check for fleas, secondary infections and other triggers instead of assuming the existing allergy medication simply stopped working.
What to track before the appointment
Photograph affected areas under similar lighting, note seasonal patterns, recent grooming or environmental changes, all medications and flea-prevention products, and whether the ears have discharge or odor. If the dog is already receiving treatment, record what improved and what did not.
Home care while you arrange an exam
Prevent excessive licking and scratching where possible, keep bedding clean and continue veterinarian-recommended flea control. Ask the clinic which bathing products are safe for your dog’s skin. Do not put human steroid creams, alcohol or essential oils on broken skin without specific veterinary instructions.
Can an online vet help?
A photo or video may help with triage or follow-up, but it cannot reliably distinguish every infection, mite infestation or allergy. A new severe or persistent skin problem often deserves in-person evaluation. The goal is a diagnosis and a sustainable itch-control plan—not just temporary relief.
Reference: Merck Veterinary Manual: atopic dermatitis in dogs.
Educational information, not a veterinary diagnosis or a claim of individual veterinary review.
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.