i did some research, and i found out that fasting is not the best way to detox your system or to give your digestive track a rest. the best way is to do a juice fast or only eat veg and fruits for a day a week or a day a month. that way you are still giving your body a chance to detox because it doesn't have to work so hard to digest the hard to digest foods, but at the same time, you are giving your body the nutrients and fuel it needs.
i wonder what is the equivalent for dogs. how do you give their digestive system a break?
