I did Dr. Dodd's NutriScan test on or girl. She came back sensitive to sooo many things. She is raw fed as well. I can only base on my experience.
Before testing I suspected chicken and pork were issues. One pork meal in the morning and by that night she had a full body rash and was itching non-stop. So, depending on how sensitive they are reaction onset can be very quick.
Ziva has been on her new diet with all allergens removed for 3 weeks. The improvement is amazing. She rarely itches. Shedding has decreased tremendously. She also eats better. Her coat is filling out and is soft and shiny.
Thyroid issues are a good place to look. Hope those results come back normal.