5 – Changes of mouth
Normally, this is rarely seen because it is difficult to think inside the mouth of the dog. It is advisable for dog lovers to get in the habit of catching any sign of cancer of the mouth.
6- Changes in behavior
Any type of cancer can dramatically change one’s general behaviors. Some are like making the dog annoying, irritable, crisp and even fierce. If, at some point, you notice a transition in your dog’s behavior, consider contacting a veterinarian immediately as this may be a sign of some type of cancer.