A dog with liver failure or liver cancer can expect to live for about half a year or six months. If your canine friends undergo surgery, their life expectancy can increase to one year. It also depends on the type of liver cancer your pooch has. If your pup has nodular liver cancer or diffuse liver cancer, then he or she may not have long to live. If there's evidence that cancer has spread to the lungs or to the abdominal organs, then your furry friends can expect to live for only a few weeks.If you suspect your dog has liver failure or liver cancer, be sure to monitor for any new changes and stay in constant communication with your vet. This way, your vet can manage your pup's symptoms.