When Bella dropped weight we gave her coconut milk/cream, sweet potatoes. When she was really sick I would make mashed potatoes with white potato, the coconut milk, butter and sweet potato ... she would always take some of that for me no matter how sore her throat was from the esophagitis.. The coconut milk will list the caloric value on the label..You will find it in any large supermarket with an Asian food section. I also made her knox bloxs with the coconut milk, water and unflavoured gelatin to keep her hydrated...she actually wasn't wild about the knox bloxs but my other two loved to get whatever she would not take .
