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The important points, first
- Record the exact product, actual amount eaten, time, treats and supplements.
- Write down observable signs without interpreting them as a diagnosis.
- Use the same scale or description to make days comparable.
- Take the diary to your veterinarian; do not start an elimination diet on your own.
What a useful diet history should contain
AAHA describes a comprehensive nutrition history as covering animal-, diet-, environment- and human-related factors. WSAVA recommends regular nutritional screening and a detailed diet history when risk factors are identified.
For each food, record the exact brand and product, format or variety, amount offered and eaten, time, preparation and opening date where relevant. Include treats, chews, table food, supplements and foods used to give medication: small extras are easily missed when relying on memory.12
Which observations to connect with meals
Record observable facts: appetite, vomiting or regurgitation, stool frequency and appearance, itching, weight, and relevant changes in activity or water intake. Note timing and duration without automatically assigning the cause to an ingredient.
Keep the method consistent: the same units, the same scale where possible and the same descriptive system over time. Photographs and notes may help your veterinarian but cannot replace examination and testing.12
Can a diary prove a food allergy?
No. A temporal association can suggest what to investigate but does not establish causation. Veterinary literature states that diagnosis of adverse food reactions relies on an elimination diet followed by controlled provocation. A critically appraised review found that trials should last at least eight weeks to identify more than 90% of food-responsive cutaneous cases.
These trials should be planned with a veterinarian. An improvised restrictive diet can be nutritionally inadequate, while contamination, treats or flavoured medication can make the outcome difficult to interpret.34
How to prepare a summary for your veterinarian
Bring a representative time range and mark food changes clearly. Summarise the timeline but retain the daily detail: start date, previous and new product, amounts, weight trend and observed signs. Report urgent signs or deterioration without waiting for a scheduled appointment.12
Sources and checks
Numbers in the text lead to the exact source. Commercial blogs and social posts are not used as evidence.
- 1Veterinary guideline
Gathering a Comprehensive Nutrition History
American Animal Hospital Association · Animal, diet, environment and human factors to include in a nutrition history.
Link checked on 15 Sept 2026 - 2Veterinary guideline
WSAVA Nutritional Assessment Guidelines
Journal of Small Animal Practice · WSAVA · Nutritional screening and detailed diet history when risk factors are present.
Link checked on 15 Sept 2026 - 3Peer-reviewed research article
Adverse food reactions in dogs and cats
Veterinary Clinics of North America: Small Animal Practice · PubMed PMID 21486641 · Clinical review: elimination and provocation remain central to diagnosis and management of adverse food reactions.
Link checked on 15 Sept 2026 - 4Peer-reviewed research article
Critically appraised topic on adverse food reactions: duration of elimination diets
BMC Veterinary Research · PubMed PMID 26310322 · Critically appraised review of elimination-trial duration in dogs and cats.
Link checked on 15 Sept 2026
A diary organises observations and cannot identify allergies, intolerances or disease. Persistent signs, deterioration or emergency warning signs require veterinary care.