A loss of blood in your dog can signify a serious health issue. It is important to make an appointment with your veterinarian. Causes may include:
Internal Parasites
Internal parasites, such as coccidia and hookworms can cause blood loss. Parasites that live in the intestines feed off of the dog’s blood, causing anemia. Heartworms and other preventable parasitic infestations may result in whitened gums.
Internal Bleeding
If your dog is bleeding internally, this may be apparent in bloody stools. Internal bleeding can cause your dog’s gums to be white. Weakened and damaged blood vessels, trauma, or hemorrhage can cause internal bleeding.
Tumors
If your dog has a tumor, either benign or malignant, it may bleed. Once it becomes larger, it may bleed more, and it may also touch the blood vessels near it. This may cause even more internal bleeding and will be an emergency situation.
Blood Clotting Diseases
Blood clotting disorders, such as hemophilia, coagulopathy, protein deficiencies, thrombosis, and other conditions may cause the gums of your dog to be white. This is due to the increased amount of anemia as the red blood cells are excessively lost when trauma or internal bleeding occur.
Chemicals or Toxins
Certain poisonous chemicals that are used to kill pests, such as rodenticides, contain anticoagulant. This anticoagulant, when ingested, causes internal bleeding. This inner loss of blood can make your dog’s gums white.
Autoimmune Disease
Certain autoimmune diseases, such as hemolytic anemia, can cause loss of red blood cells. Dogs with this condition have an abnormal immune system that overreacts to otherwise healthy cells. These healthy red blood cells can be destroyed, and will cause anemia.