Skin issues, itching and digestive problems are some of the most common reasons dog owners seek help. Many assume it’s an allergy, but quite often the real cause is food intolerance. The two problems look similar, yet differ greatly in origin, symptoms and treatment.
What Is Food Intolerance?
Food intolerance is a non-immune reaction where the dog’s body cannot properly digest a certain ingredient.
Typical signs of intolerance
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Diarrhea, vomiting, flatulence
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Soft or inconsistent stools
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Digestive discomfort after certain proteins or grains
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Bad breath or odor from skin
What Is a Food Allergy?
A food allergy is an immune response where the body reacts to a harmless ingredient as if it were dangerous.
Typical signs of allergy
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Itching, scratching, licking paws
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Red skin, rashes, hotspots
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Recurrent ear infections
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Poor coat quality
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Occasional digestive problems
Key Differences
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Immune system: allergy = involved, intolerance = not
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Symptoms: allergy → skin & ears; intolerance → digestion
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Onset: allergies appear quickly, intolerance develops gradually
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Diagnosis: elimination diet is essential for both, but allergies show clearer immune markers
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Management: allergies require full avoidance; intolerance may allow partial adjustments
What to Do if You Suspect a Problem
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Start an elimination diet for 6–8 weeks
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Use only allowed treats
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Monitor skin, digestion and energy levels
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Support gut and skin with omega-3s and probiotics
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Choose monoprotein or hypoallergenic formulas
Understanding the difference helps you choose the right nutrition and improve your dog’s wellbeing for the long term.