First, all allergies, even seasonal, may have a genetic component. Second, has the vet looked at these pups? It is unusual for that many in a litter to have allergies, and this could be a nutritional deficiency or something else not allergies. Even if it isn’t allergies, switching foods is the first thing I would try, in case there is something missing in the diet.
AAFCO recognizes 2 nutrient profiles, Growth and Maintenance. If a food qualifies for growth, the company may choose to label it as All Life Stages. All Life Stages foods are good for ALL life stages
