Whilst allergies in our dogs and cats are extremely common, their signs can often be overlooked or unintentionally minimized by owners. At times, these pets will come in for a variety of signs such as itching, scratching, redness, sniffing or gastrointestinal upset, but it can take months before owners recognize these as being associated with an allergy.
Recognizing the pattern matters. Untreated allergies not only affect your pet’s physical appearance, but they can also impact their quality of life, behaviour, digestion and breathing. Let’s begin by breaking down what happens when your pet develops a skin allergy, and when to know it’s time to seek veterinary care.
What Are Allergies? A Quick Vet Explanation
Allergies occur when a pet’s immune system inappropriately reacts, or overreacts to harmless substances, like pollen, dust, food proteins, or insect saliva. This triggers inflammation and discomfort andcomfort, and can also lead to further issues. Allergens can enter the body through the skin, respiratory system, or GI tract, provoking different signs depending on the source.
Common Allergy Types in Dogs
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Food allergies - These occur due to an immune response to dietary ingredients, commonly food proteins.
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Environmental (airborne) allergies - Occur seasonally or year-round, due to environmental allergens such as dust, pollen and mould.
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Flea allergy dermatitis - a more uncommon occurrence for dogs, this occurs when the body reacts to the saliva after a flea bite.
Dog Allergy Symptoms Owners Often Miss
1. Paw Licking, Chewing & Face Rubbing
Constant licking of the paws or chewing at body parts can oftentimes be mistaken for normal grooming, and in reality, could be a sign of allergy.
2. Recurrent Ear Infections
If your dog is constantly battling with ear infections, this is a sign to rule out skin allergy. Chronic inflammation, redness, odour and discharge are just a few signs that can point to a skin allergy as the underlying problem, and until this is addressed, recurrent ear infections are likely going to remain a problem for your beloved pet.
3. Subtle Skin Changes
While skin changes are often drastic in skin allergy, subtle changes may also occur in the early stages and can sometimes be misdiagnosed. These signs can include scaly or flaky patches, mild hair loss, head shaking and hyperpigmentation changes.
4. Sneezing & Runny Nose
While respiratory signs are typically classified as upper or lower respiratory tract disease, sneezing or nasal discharge can point to seasonal allergy, particularly if they coincide with changes in the season.
Allergy Signs in Cats
Unlike dogs, cats attempt to mask their discomfort or pain, making an allergy diagnosis slightly more difficult for owners to spot.
1. Over-Grooming & Bald Spots
Cats with allergies will often lick or chew at their skin obsessively, until the fur begins to thin. Common locations to look out for include the abdomen and thighs. When you see hair loss, don’t think it’s just over-grooming or stress; there is likely an underlying reason for this pain or irritation.
2. Chronic Ear Infections
Like dogs, cats can develop ear infections that present due to an underlying skin disease. These infections can cause severe skin inflammation and itch or pain.
3. Subtle GI Upset
Frequent vomiting, diarrhea/soft stool and flatulence may not just be due to a “sensitive stomach” but may be a sign to rule out an underlying food allergy.
4. Respiratory or Eye Signs
Sneezing, itchy eyes, or runny discharge can also be allergy-related, oftentimes more frequently than seen in dogs.
Why Allergies Are Hard to Spot, Even for Attentive Owners
Pets with allergies may not show dramatic reactions like humans (no obvious hives or sneezing). Instead, their bodies tend to react with chronic inflammation, meaning:
- Itching comes and goes
- Symptoms may look like infection or poor grooming
- Gastrointestinal signs can be inconsistent
- Seasonal patterns aren’t always obvious
Some pets have both skin and GI symptoms, which can also add to the confusion.
When to See Your Vet
If your dog or cat shows one or more of the following, a veterinary evaluation can determine whether allergies (or something more serious) are the underlying cause:
✔️ Persistent itching
✔️ Recurrent ear infections
✔️ Hair loss, redness or skin sores
✔️ Chronic vomiting or diarrhea
✔️ Sneezing, eye discharge, or respiratory changes
Allergy Management is a Team Effort
Unfortunately, management of allergies in pets is often not a quick fix. In working up a suspected allergy, your veterinarian may recommend tests to rule out parasites or infections, elimination diets for suspected food allergies, targeted allergy testing and immunotherapy plans, as well as tailored medical and nutritional management. While much of the success in allergy treatment relies on long-term planning, dietary strategies, environmental changes, and supportive therapies, successful allergy treatment will truly improve your pet’s quality of life and is well worth the patience.
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