Dogs can survive for about 7 days if they only drink water

If the dog does not eat, does not supplement nutrition in any way, and only feeds water, the average dog can only live for about 7 days. If the dog needs to fast when it is sick, it can choose to supplement its daily energy needs through infusion. If the dog does not eat due to anorexia, picky eating, etc., then you can feed the dog some Dogs like to eat canned food to help dogs improve and stimulate their appetite.