Allergies can be caused by outside environmental reasons, like grasses, trees, pollens, bee or wasp stings, ant bites, or they can be caused by internal reasons, new soaps, powders, shampoos, laundry products, or air fresheners. Allergies can also be caused from foods, or treats. I'm glad you are transitioning her to Fromms from Purina. Purina is definitely not great food, and Fromms is a 6 star food, so is an excellent choice. Many bullies are allergic or sensitive to chicken, and lamb can also cause reactions. You can try any of the Fromms flavours without having to do,a slow transition, since they are all interchangeable without causing tummy troubles. Is there a reason why you are not feeding her a puppy formula? Fromms does have a Puppy kibble as well. Her chin rash could also be caused by her bowls. What kind of bowls do you use? Stainless Steel or Plastic? It is best to use stainless steel, because plastic bowls tend to get scratches or gouges in them and these can hold bacteria which can cause chin rashes and irritations. Stainless steel bowls are best, and should be cleaned everyday. I put our bowls In the dishwasher every evening and wash them overnight. You can also try to,use filtered water instead of tap water, as this can also cause chin rashes. Do you clean Wilmas face and nose ropes everyday with an unscented baby wipe or warm wash cloth? The nose ropes, and chin can hold moisture and bacteria in the folds and also cause irritations. Keeping her face clean and dry, will help. You can try using witch hazel to clean her folds as well. I hope it clears up soon. Please keep us posted on how she's doing.