If it is relatively mild dehydration, you can use a syringe to feed the cat water, or perform an enema. You can raise the cat's tail and inject nutrient solution and water, which can be quickly absorbed directly by the intestines. If the cat is severely dehydrated due to frequent diarrhea or vomiting, it is best to go to the hospital and give the cat an intravenous injection. It is recommended to choose sodium chloride injection or sodium lactate Ringer's injection, which can control the flow rate to achieve a large and continuous flow. of transportation. If the dehydration is so severe that the blood vessels become deflated and cannot be inserted, you can also choose to inject rehydration under the skin, preferably in the nape of the neck and back.