Good information from this website:
“About ten percent of the allergies seen in dogs are caused by allergic reactions to food. They are also a major cause of itching and scratching. The way a pet becomes sensitized to a particular food agent, which in turn creates a complicated antibody response in the dog’s intestinal tract, is not very well known. Despite our lack of understanding of how food allergies affect our dogs, there are many things we are certain of – the symptoms, and how to diagnose and treat food allergies.”
Food allergies do not respect gender as they affect males and females equally. The first signs of allergies can be detected as early as five months and as late as 12 years of age within the dog’s life span.