If you’ve ever lived with a dog who constantly itches, licks, or chews, you know how relieving it is when you finally figure out what’s causing it. In Wally’s case, eliminating certain proteins stopped the itching — but it also left me wondering whether those foods were gone from his bowl for good.
That question lingered for years:
Can dogs outgrow food allergies or sensitivities?
For years, my answer would have been a cautious “maybe — but don’t count on it.”
Then something unexpected happened with my dog Wally that made me rethink everything I thought I knew about canine food sensitivities.
In this post, I’m sharing:
- Wally’s long history with food sensitivities
- why I completely removed certain proteins for over six years
- how I accidentally discovered he could tolerate them again
- what science says about whether food sensitivities can resolve over time
- and how to approach reintroductions safely (if at all)
This isn’t medical advice — it’s a real-life case study paired with what current research and veterinary nutrition experts actually say.
Who I Am — and Why Wally’s Story Matters
I’m Barbara Rivers, the founder of K9sOverCoffee. I’ve been feeding raw dog food since 2015 both in the US and Germany, and started preparing my own meals in 2016. In 2024, I began working for one of Germany’s leading raw dog food brand, BARFER’S.
Over the years, I’ve helped hundreds of dog owners navigate food sensitivities, elimination diets, and raw feeding transitions.
Wally is my adult dog and longtime raw-fed companion. He’s also the dog who taught me that food sensitivities aren’t always as permanent as we’re led to believe.
Wally’s Original Food Sensitivities
For many years, Wally reacted poorly to a long list of raw dog food ingredients, including:
- chicken
- salmon
- sardines
- quail
- lettuce
Chicken, salmon and sardines were the worst offenders. Even small amounts caused intense itching, scratching, and discomfort.
As a result, I did what most responsible dog owners do: I completely removed those ingredients from his diet.
No rotating.
No “just a little.”
No “maybe it’ll be fine this time.”
And it worked.
Once those proteins were gone, Wally’s skin calmed down, his coat improved, and the constant itching stopped. For the next six years, chicken, salmon and sardines simply didn’t exist in his bowl.
Why Long-Term Avoidance Is Often Recommended
In dogs with food sensitivities (which are far more common than true IgE-mediated food allergies), repeated exposure can keep the immune system in a constant state of activation.
Veterinary dermatologists often recommend:
- strict elimination diets
- prolonged avoidance of trigger proteins
- limiting unnecessary dietary variety during healing phases
The goal isn’t just symptom control — it’s allowing the gut barrier and immune system to stabilize.
And that distinction matters.
The Accidental Discovery: What Changed on Our Camping Trip
Fast forward six years.
During a fall camping trip with our younger dog, Pepper, I ran out of some of Wally’s usual proteins. Without overthinking it, I offered him a small amount of chicken I had bought for Pepper at a local grocery store.
I expected itching.
I expected regret.
Instead… nothing happened.
No scratching.
No licking.
No flare-up later that day or the next.
That moment was my first real clue that something in Wally’s body had changed.
Can Dogs Outgrow Food Allergies or Sensitivities?
Here’s where language matters.
Most dogs diagnosed with “food allergies” actually have food sensitivities or intolerances, not true allergies. True food allergies involve an IgE (immunoglobulin E)-mediated immune response and are considered lifelong.
Food sensitivities, on the other hand:
- involve delayed immune reactions
- are often gut-mediated
- can fluctuate over time
Several veterinary nutrition sources acknowledge that sensitivities may resolve after long-term avoidance, especially if gut health improves and inflammatory triggers are reduced.
Research in both human and veterinary medicine shows that:
- immune tolerance can re-develop after prolonged absence of an antigen
- intestinal barrier integrity plays a major role in food reactions
- early or repeated exposure during inflammatory states increases sensitivity risk
While large-scale canine studies are limited, clinical observations from veterinary dermatology and nutrition support the idea that some dogs may tolerate previously problematic proteins again — under the right conditions.
Having said that, several studies link early exposure to raw foods with lower rates of allergy-related skin symptoms later in life.
One research project involving over 4,000 dogs found that puppies fed raw tripe and organ meats, or at least 20% raw food, had significantly less allergy and atopy as adults — suggesting a possible protective effect of raw feeding early in life.
What Likely Helped Wally Tolerate Proteins Again
I can’t point to a single magic factor, but several things likely contributed:
1. Long-Term Strict Avoidance
Six years without chicken, salmon and sardines gave Wally’s immune system a real break. No accidental exposures. No slow-burning inflammation.
2. A Fresh, Species-Appropriate Diet
A raw, minimally processed diet may support:
- gut microbiome diversity
- improved nutrient absorption
- reduced inflammatory load
Gut health and immune regulation are closely linked.
3. Overall Immune Stability
As dogs age, immune responses can change. What once triggered overreactions may no longer do so — especially if the body isn’t constantly under stress.
Does This Mean All Dogs Can Eat Their Old Trigger Foods Again?
No — and this part is important.
Some dogs:
- will never tolerate certain proteins
- have true allergies that do not resolve
- relapse quickly when reintroduced
That’s why reintroduction should never be rushed or assumed safe.
Wally’s experience shows that it can happen — not that it will happen.
How (and If) to Reintroduce Proteins Safely
If you’re considering reintroducing a previously problematic protein, caution is essential.
General best practices include:
- waiting until your dog is symptom-free for an extended period (I’d say a minimum of one year)
- introducing one protein at a time
- feeding small amounts for several days
- monitoring skin, ears, stool, and behavior
- stopping immediately at the first sign of a reaction
Many veterinary dermatologists recommend structured food challenges under guidance, especially for dogs with severe histories.
Why This Story Matters for Dog Owners
Food sensitivities can feel permanent — and emotionally exhausting.
Wally’s story doesn’t promise a cure.
But it offers something just as valuable: realistic hope.
Hope that:
- healing is possible
- bodies can change
- strict avoidance isn’t always forever
Sometimes, patience really does pay off.
Bottom Line
So — can dogs outgrow food allergies or sensitivities?
In some cases, yes.
Especially when sensitivities (not true allergies) are involved, long-term avoidance and improved gut health may allow tolerance to return.
Wally’s journey is proof that even (or especially) after years of strict dietary limits, change is possible.
And sometimes, it shows up when you least expect it — like on a quiet camping trip, with a bowl of chicken you never thought you’d feed again.
Related Reading
- Dog allergies: Top 3 causes and how to help naturally
- Raw dog food recipes & tips for dogs with allergies
- How I got rid of my Foster dog’s skin allergies
- How to do an elimination diet
- Kangaroo raw dog food
Barbara Rivers is the founder of K9sOverCoffee and a raw feeding educator with over a decade of hands-on experience.
She has fed raw in the US and Europe since 2015, after her Boxer mix Missy’s cancer diagnosis led her to move away from processed kibble and commit to species-appropriate nutrition.
As a former professional dog walker, she developed deep insight into canine behavior, conditioning, and the essential link between proper exercise and long-term health.
Barbara completed online training with veterinarian Dr. Marion Smart and Labrador breeder Dana Scott and works for one of Germany’s leading raw dog food brands, BARFER’S.
In 2026–2027, she is completing a year-long raw nutrition certification for dogs and cats at THP School, founded by raw feeding pioneer Swanie Simon.
Through her blog and weekly newsletter, she provides clear, experience-based guidance to help dog owners feed raw safely and confidently.
Very good article. It matches my experience as well. The dogs who don’t recover and are on a raw (or fresh) diet may have issues with their pancreas. After doing a deep dive into the pancreas and pancreatitis, I discovered a few things: one culprit well known in the human space is also not well known in the canine (not sure about cats) and the pathogen is zoonotic (between disparate organisms, like dogs and humans) and that is H.pylori. Veterinarians insist that this isn’t possible and most dogs, even those with it will test negative, I believe have it. Why? Their human infected them. However, in the human space, this pathogen has been known to make its home in the pancreas and many cases of human pancreatitis is due to H.pylori. What if this is true in the canine space as well? A food sensitivity is not pancreatitis, but this article touched on gut barrier issues. I am of the opinion that if a dog has food sensitivities that do not go away and has a list a mile long (yours was rather short compared to other dogs whose test results I have seen), the issue may be the gall bladder.
I think my dog’s issue was actually glyphosate. The body can clear glyphosate over time but the problem is that if we feed commercially prepared dog food whose sourcing is unknown to us (don’t even think about organic … unless you are a millionaire), the dog may be ingesting a little glyphosate with each meal. But glyphosate’s worse problem is that it creates leaky gut, often the precursor to a mile-long list of food that tested positive in a dog’s food sensitivity test. When I went to fresh food that uses proteins pulled out of MY freezer with organs from a local farmer, he can now eat just about anything except raw salmon. This may be due to the fat content as most dogs that I know are sensitive to salmon oil (for omega-3) but not Nordic Naturals, which uses anchovies, krill, sardine or mackerel.
I noticed rusty eye tears staining on our new golden puppy. So by 4 months old I ordered a test from Glacier Peak Holistics. He’s sensitive to chicken, beef,pork, lamb and a bunch of other things. I’m a raw feeder since 2009, so I cut out those things. It’s been about 13 months so I just ordered a test, crossed my fingers that I can add beef. Might even try organic chicken!