Well, I've been fasting my Siberian Husky (Suka), a 6 year old female. I've been feeding her Primally (meat, bones and organs) from clean/wild sources, for years now, but in the past 10 months or so, I was over doing it. On zero carb, but in huge abundance, a Husky can certainly get fat!
So in the most recent couple months, I've been paying attention to portion, and forcing some fasts on her. I join in on the fasts as well. It's been good for both of us. She's lean, mean and chipper as all get out.
In that short time frame, I've realized how my dog, cats and myself have pretty much the same needs:
animal based nutrition
naps in full sun