You will lose a pound if you burn 3500 more calories than you take in. This is one of the bottom lines in weight loss but whether or not you are actually burning 3500 calories varies from person to person with the same activity.
A dog can survive without eating for 14 days, procided day wouldn't be in good shape and health.
However, if a person is very sick, or in a vegetative state from a stroke or severe brain injury, that person can only survive approximately 10-14 days without food. How long can you live without water? The usual survival time without water is 3 days, but there have been occasional occurrences of people surviving 8-10 days without water. How long can you live without breathing? Usually a person can only survive 3 minutes without breathing, although there are women divers In Japan and other countries who dive for abalone or pearls who are able to survive for 5 minutes at a time, even diving to a depth of 100 feet, on a single breath, though this requires years of training.