Is a dog sick if it doesn’t eat and only drinks water to sleep?

There are several reasons why dogs do not eat and only drink water to sleep. One possibility is that the dog is not interested in the food of the moment and is a picky eater. In this case, there is nothing to worry about and the dog can be fed some of its usual favourite foods. The other is illness-related anorexia, which is the initial symptom of an illness accompanied by other symptoms such as fever, poor spirits and loss of appetite. If it is a disease anorexia, take your dog to the doctor promptly.