Food Allergies in Pets Are More Common Than You Think
Food allergies and intolerances affect a significant number of cats and dogs, yet they're frequently misdiagnosed or overlooked. The symptoms can mimic other conditions, and because most commercial pet foods contain a long list of ingredients, identifying the culprit can feel impossible.
Knowing what to look for — and what to do about it — can make a real difference in your pet's quality of life.
Common Signs of a Food Allergy in Cats and Dogs
Skin and Coat Issues
- Persistent itching, especially around the face, ears, paws, and belly
- Red, inflamed, or flaky skin
- Recurring hot spots or skin infections
- Hair loss or a dull, thinning coat
- Excessive grooming in cats
Digestive Symptoms
- Chronic vomiting or regurgitation
- Loose stools, diarrhoea, or constipation
- Frequent flatulence
- Bloating or visible abdominal discomfort
- Poor appetite or sudden food aversions
Behavioural Signs
- Restlessness or irritability
- Excessive licking or chewing of paws
- Rubbing face against furniture or carpet
- Low energy or lethargy not explained by other causes
Food Allergy vs Food Intolerance — What's the Difference?
These terms are often used interchangeably, but they describe different reactions:
Food allergy involves the immune system. The body identifies a protein (usually) as a threat and mounts an immune response. Symptoms often include skin reactions and can appear even with tiny amounts of the offending ingredient.
Food intolerance is a digestive issue. The body struggles to process a certain ingredient — dairy and certain grains are common culprits. Symptoms are typically gastrointestinal.
Both can significantly impact your pet's wellbeing and both are worth taking seriously.
What Causes Food Allergies in Pets?
The most common food allergens in cats and dogs are proteins — specifically the proteins your pet has been exposed to most frequently over their lifetime. Common culprits include beef, chicken, dairy, wheat, and egg.
This is one reason why variety in protein sources matters, and why a monoprotein approach is so useful for pets with sensitivities: it allows you to clearly identify which proteins your pet tolerates and which they don't.
What to Do If You Suspect a Food Allergy
Step 1: Visit Your Vet
Rule out other causes first. Skin issues can stem from environmental allergens, parasites, or underlying health conditions. Your vet can help confirm whether food is the likely trigger.
Step 2: Start an Elimination Diet
An elimination diet involves feeding your pet a novel protein — one they've never eaten before — for a minimum of 8–12 weeks. This is the gold standard for identifying food allergies.
During this period, your pet should eat only the elimination diet food. No treats, table scraps, or flavoured supplements. Even small amounts of the allergen can skew the results.
Step 3: Reintroduce Proteins Gradually
Once symptoms resolve, reintroduce proteins one at a time, waiting 2 weeks between each. If symptoms return after a specific protein is added back, you've found your allergen.
Step 4: Switch to a Monoprotein Diet Long-Term
Once you know which proteins your pet tolerates, a monoprotein diet makes it easy to stay safe. With only one protein per recipe, there's no guesswork and no hidden ingredients.
How Nobili Nutrition Can Help
Our entire range — FELIS Nobili for cats and CANIS Nobili for dogs — is built on the monoprotein principle. Every recipe contains a single, clearly labelled protein source with no fillers, no by-products, and no hidden ingredients.
If your pet is going through an elimination diet or you're managing a known sensitivity, our range makes it straightforward to control exactly what they eat.