I have recently just got a teacup yorkiepoo, she's 6 years old and her name is Gidgit. She will not eat or drink. I don't know if it just the food or what. Her past owners fed her Purina. So I tried to stay somewhat close to that and got her Purina one. She was doing fine and eating very well for awhile but now she could care less. She will not drink anymore either. She lays around all day and doesn't care to be outside any longer then she has to. She seems very happy and loves to cuddle but is acting very lethargic. Please can someone help me out here?