My Dog…..could This Be Allergies??

My dog is scratching alot at her face and her neck and I am wondering if this could be allergies? If it is could it be the food? Every since we started her on this food she is on now she has been trying to bite (could be play biting…….she is wanting to bite) and I’ve noticed more of the itching. She has been checked for fleas and worms and negative there. Any opinons?