4. Vomiting

Vomiting is a general sign that can occur for many reasons from motion sickness to an infection or virus, or a more serious decline. For the dog with a terminal diagnosis, when the digestive system begins shutting down, undigested food in the stomach can make the dog feel nauseated. He may vomit to purge the contents of his stomach. Starting to vomit is a serious complication, especially as he may not keep water down and become dehydrated. However, for the dog that has been relatively well and suddenly starts to be sick, there may be options to make him more comfortable and buy him more time.