When a veterinarian or oncologist says your dog is in remission, they mean that your dog’s cancer has gone away to some degree. (How much will vary upon the illness and how the oncologist thinks about remission.) Veterinarians often put words like “partial” or “durable” in front of the word remission, to help you understand that your dog isn’t completely cured. Dog lovers often use the word remission to mean “complete” remission, which means that there are no signs of cancer in the body at all. It should be noted that just because a dog is in remission does not mean that they are cured; there are often undetectable cancer cells still in the body that could cause it to recur.