Purina pro plan

I keep seeing stuff all over social media about purina pro plan making dogs sick and stuff. What truth is there to this? I feed both my dogs PPP and am worried about it effecting their health now. If anyone has any reccomendations on other food to try for picky eaters (allergic to chicken) lmk! I've been wanting to try stella and chewys hard food but idk how good it is quality wise but we don't sell it so cant use our employee discount :(