What Does Dark Spotss On A Dogs Gumbs Mean. Melanoma is the type of oral cancer most commonly seen in dogs. Black spots are mainly caused due to the existence of severe gum diseases such as bruises.
These annoying dark spots can signify a harmful or deadly dental condition, determined by. Any raised black spots along the gum line could also be an indication of oral cancer, which is one of the most common types of cancer for dogs. You could be dealing with a cancerous tumor or melanoma.