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STORY AT-A-GLANCE Persistent itching, digestive upset, and anxious behavior in pets could point to histamine intolerance a hidden cause that many overlook when allergies and diet changes don't solve the problem Histamine is a natural chemical that helps defend your pets body, but when it builds up too much, it can trigger itching, gut issues, breathing problems, and even behavior changes Gut damage, liver overload, certain medications, environmental allergens, and chronic stress can block your pets ability to break down histamine properly, making symptoms persist despite regular treatments High-histamine foods, such as aged cheeses, processed meats, fermented products, and certain types of fish, can worsen symptoms

In summary, G6PD deficiency drug-induced haemolytic reactions are preventable with the right knowledge and systems in place

This assertion is backed by some early animal research

FAS, fatty acid synthase

Medically reviewed by Alan Lucks | MD , Alan Lucks MDPC Private Practice - New York on January 17th, 2026