I recently adopted a 2 yr old shelte female. She was spayed 2 days ago. She is refusing to eat the dry food (purina dog chow) I gave her. She however has no trouble eating the little pieces of chicken I use to wrap her pain meds in. Because she is overweight, I suspect she has been fed table scraps and/or wet food. Do I need to feed her wet food or wait for her to eat the dry when hungry enough. She is my first dog in many many years.