I just changed Jackie's food to Purina Pro Plan Selects Turkey for Puppies because her old food was giving her the runs. I started the new food on Friday and since then she has been one sleepy dog. She will sleep for about three hours straight and then wake for an hour and go back for another three hours. She used to only takes one *good* nap a day before this food so I am wondering if the turkey is making her sleepy. I remember reading somewhere that Turkey has a chemical in it that makes you sleepy. Has anyone else experienced this with turkey based dog food?