Whether a severely dehydrated cat can be rescued depends on the cat's condition and timely treatment. It is best to send the cat to the pet hospital for infusion first. This way, the hope of rescue is higher. If the cat is already in a dying state, then it can be rescued. The hope is relatively small. Generally, vomiting and diarrhea will cause dehydration in cats. When this happens, cats should be supplemented with nutrients and water to avoid death from dehydration.