My corgi is 2 yr and she is healthy but seems to have zero energy. I feed her Natures Variety raw diet and dry (breeder rec), she's been to the vet and is healthy but wants to sleep or lay around all day. When I take her for a walk at the park she doesn't seem to want to walk and I have to pull on the leash to get her to move. Oh and she's not overweight. Any advice?