Itchy skin, recurring ear infections, paw licking, and tummy trouble can all point to dog allergies. Because allergies can mimic parasites, infections, or even boredom, the real trigger is easy to miss. The good news: most dogs improve a lot with a step-by-step plan and veterinary guidance. (This article focuses on safe, commercial diets and does not recommend raw diets.)

Common types of dog allergies (and what they look like)

Environmental allergies (atopic dermatitis): pollen, grasses, mould, dust mites; often seasonal at first. Signs include itching (face/paws/belly/groin), hot spots, and chronic ear issues.
Flea allergy dermatitis: allergy to flea saliva—one bite can trigger major itching. Look for intense itch around tail base/rump, scabs, hair loss; fleas “dirt” may be hard to find.
Food allergies/sensitivities: often year-round itch, recurrent ear infections, rashes/hives in some dogs, and sometimes vomiting/diarrhoea/gas.
Contact allergies (less common): reactions to shampoos, cleaners, fabrics, lawn chemicals—usually redness/itch where skin touches the trigger.

Dog allergies symptoms: what to watch for

Itching, licking, chewing, rubbing (paws, face, belly)
Red/inflamed skin, bumps, hives, scaly patches; hair loss
Ear trouble: head shaking, odour, discharge, redness
Hot spots and recurrent bacterial/yeast infections
Digestive upset (more suggestive of food-related issues)

Call your vet promptly for facial swelling, trouble breathing, collapse, or severe vomiting/diarrhoea.

Why allergies often lead to infections

Inflamed skin plus scratching breaks the skin barrier, letting yeast/bacteria overgrow—fueling an itch-scratch cycle. Clues include a greasy/yeasty smell, oozing/crusting, pustules, darkened/thickened skin, or persistent ear odour/discharge.

How vets diagnose dog allergies

Rule out parasites first (fleas/mites). Flea prevention is often recommended even if you don’t see fleas.
Check/treat infections (skin/ear cytology).
Food trial: a strict 8–12 week elimination diet using a vet hydrolysed or novel protein diet—no treats, flavoured meds, or extras unless approved.
Environmental allergy testing (skin or blood) mainly to build allergen-specific immunotherapy.

Allergy treatment options that actually help

Flea control: vet-recommended preventatives, wash bedding, vacuum.
Diet strategy: stick to the prescription trial; use kibble as treats; track itch/ears/stools weekly.
Itch control meds: prescription anti-itch options, short-term corticosteroids in some cases, antihistamines for select dogs—vet-guided.
Immunotherapy: customised shots/drops; takes months but can reduce medication needs.
Treat infections: prescription ear meds/cleansers, medicated shampoos/wipes, sometimes oral meds.
Skin support: regular bathing, paw wipes after walks, leave-on moisturisers, vet-approved omega-3s.

Reducing triggers at home

Wipe paws/belly after walks; wash bedding weekly; vacuum (HEPA helps)
Keep coats clean/brushed; avoid harsh fragrances if contact irritation is suspected

Key takeaways: allergies often show as skin/ear issues, flea control matters for every itchy dog, food allergies require a strict vet-guided diet trial, and secondary infections must be treated alongside the underlying allergy. Most dogs do best with consistent home care + targeted veterinary therapies.