I just switch my chihuahuas food and after reading the label I realized that my dog - which is a whopping eight (8) pounds eats ~300 calories or 40 kcal per pound. That is like me eating over 6,000 calories a day! What a metabolism!
I'll have to check my dog's food. My dogs would eat me out of house and home if I let them - yet they rarely seem to gain a pound. I covet their metabolism and their never-ending energy, that's for sure!