Probable walnut-induced anaphylactic reaction in a dog

Area of Science:

• Veterinary Medicine
• Immunology
• Toxicology

Background:

• Anaphylaxis is a common severe allergic reaction in humans, often triggered by nuts.
• Nut-induced anaphylaxis has not been previously documented in canine species.
• This case highlights a potential gap in veterinary understanding of food allergies.

Observation:

• A 5-year-old female Vizsla presented with acute gastrointestinal and respiratory distress, along with skin wheals.
• Clinical signs began hours after ingestion of walnuts, a food previously consumed in small amounts.
• The dog was diagnosed with generalized anaphylaxis.

Findings:

• Diagnostic workup included skin testing and Western blotting.
• Both tests yielded positive results for walnuts and hazelnuts, confirming specific allergen sensitivities.
• This suggests a specific IgE-mediated hypersensitivity to tree nuts.

Implications:

• Veterinarians should consider severe allergic reactions to common or unusual food items, including nuts.
• A comprehensive food history is crucial for diagnosing adverse food reactions in dogs.
• Allergen-specific testing can aid in confirming diagnoses and guiding long-term dietary management for canine food allergies.