Dog Food Allergy vs Environmental Allergy: How to Tell the Difference

A detailed look at how we navigated Alice\'s severe itching and ear infections, including our experience with elimination diets and managing environmen

Alice's Allergy Journey: How We Figured Out Food vs Environmental

When Alice was about two years old, she started scratching her ears constantly and licking her paws until they were raw. I initially thought it was just a seasonal thing, maybe some pollen from our daily walks in the park. It took us nearly a year of vet visits, diet changes, and a lot of trial and error to figure out exactly what was causing her discomfort.

The Early Symptoms

Alice is a chow shepherd mix, which means she has a very thick double coat that can hide a lot of skin issues. I didn't notice the redness on her belly right away. The first real sign was the sound of her licking her paws in the middle of the night. It was a wet, repetitive noise that would wake me up at 3 AM. Then came the ear infections. She would shake her head so hard her ears would flap loudly against her collar, and there was a distinct yeasty smell coming from her ears.

Our vet initially prescribed Apoquel to stop the itching. It worked almost immediately. Within a day, she stopped scratching and the redness started to fade. While I was relieved she was finally comfortable, I wanted to find the root cause rather than just managing the symptoms long-term. Apoquel is great, but it suppresses the immune system's itch response, and I worried about having a two-year-old dog on it for the rest of her life. The vet explained that allergies in dogs generally fall into two categories: food and environmental. We decided to tackle food first because it's something we could completely control.

The Elimination Diet

We started with a strict hydrolyzed protein diet using Royal Canin HP. The proteins in this food are broken down into pieces so small that the dog's immune system doesn't recognize them as allergens. The rule was simple but difficult to execute: for eight weeks, Alice could eat absolutely nothing else. No treats, no table scraps, no flavored medications. Even her monthly heartworm preventative had to be switched from a beef-flavored chew to a topical application.

It was tough. Alice was used to getting little bites of whatever I was cooking, and training without high-value treats required a lot of adjustment. I ended up using pieces of her prescription kibble as rewards, which she accepted with mild disappointment. We had one major setback around week four when she managed to snatch a piece of dropped cheese from the kitchen floor. We had to restart the eight-week clock. Around week six of the restarted trial, her skin cleared up significantly. The paw licking stopped entirely, and her ears looked clean and pink instead of angry red. This strong response pointed us directly toward a food allergy.

Reintroducing Proteins

Once we had a clean slate, we slowly introduced single proteins back into her diet to see what she reacted to. Chicken was the first test. I boiled some plain chicken breast and gave her a small amount with her prescription food. Within three days, the paw licking returned, and her belly got red again. We went back to the hydrolyzed food until her symptoms cleared, then tested beef. Beef caused a similar, though slightly milder, reaction.

We eventually found that she does perfectly fine on fish and lamb. She now eats Purina Pro Plan Sensitive Skin & Stomach Salmon & Rice formula. Finding treats was another challenge, but we stick to single-ingredient options like freeze-dried salmon or dehydrated lamb lung. I have to be very careful about reading ingredient labels now, as chicken fat is often used as a coating even in non-chicken kibbles. I've become that person standing in the pet store aisle reading the fine print on every bag of treats.

Environmental Factors

Even with the food sorted out, Alice still had flare-ups in the spring and fall. Her food allergies were clearly only part of the puzzle. We opted for a blood test for environmental allergens. The results showed she is highly reactive to dust mites, storage mites, and several types of grass common in our area.

Managing environmental allergies requires a different approach than food allergies. You can't put a dog in a bubble. We started a routine of wiping her paws and belly with Douxo S3 PYO chlorhexidine wipes after every walk to remove pollen and grass allergens. We also switched to washing her bedding in hot water every week to keep the dust mites down. I store her dry food in an airtight container and wash it out before adding a new bag to prevent storage mites from multiplying.

During her peak allergy seasons, we bathe her every two weeks with Malaseb medicated shampoo. You have to leave it on for ten minutes before rinsing, which feels like an eternity when you have a wet, unhappy chow mix in the tub. I usually smear some peanut butter on the shower wall to keep her occupied. We also run a HEPA air purifier in the bedroom where she sleeps, which seems to help with her morning congestion.

What This Means for Dodo

Now that we have Dodo, I find myself hyper-aware of any scratching or paw licking. Dodo is a mini chowdoodle puppy born in December 2025, so she's still very young and hasn't shown any signs of allergies yet. Puppies rarely develop environmental allergies before they are at least six months old, as their immune systems need time to become sensitized to allergens. If you are curious about her early days, I wrote more about bringing Dodo home.

Having gone through this extensive process with Alice makes me feel much more prepared if Dodo ever develops similar issues. I already know how to read dog food labels properly and I'm familiar with the elimination diet protocol. I also know not to panic at the first sign of an ear infection. If Dodo does start showing symptoms, we can skip the guesswork and go straight to the methods that work.

Managing a dog with allergies is an ongoing process of adjusting to their needs. Alice is nine now, and while she still gets the occasional itchy ear or red paw, her quality of life is so much better than it was during that first year. Figuring out her triggers took a lot of time and patience, but seeing her comfortable and happy makes all that effort worthwhile.