What Is Anemia?
Anemia is a condition in which a pet has an abnormally low number of red blood cells or insufficient hemoglobin to carry oxygen effectively through the body. It is not a diagnosis itself but a sign of an underlying problem — such as blood loss, destruction of red blood cells, or failure to produce them.
Understanding Anemia
Red blood cells carry oxygen from the lungs to every tissue in the body. When their numbers fall below normal, organs and muscles become oxygen-deprived, causing the characteristic signs of anemia: pale or white gums (one of the fastest ways to spot it at home), lethargy, weakness, rapid breathing, and reduced exercise tolerance.
Veterinarians classify anemia as regenerative (the bone marrow is actively producing new red blood cells in response) or non-regenerative (production is impaired, often signaling a more serious underlying condition). This distinction significantly affects prognosis and treatment direction.
Common causes in dogs and cats include: flea or tick infestations causing blood loss, immune-mediated hemolytic anemia (IMHA) where the body attacks its own red blood cells, chronic kidney disease (the kidneys produce a hormone that stimulates red blood cell production), certain toxins including onions and garlic, and blood-sucking parasites in kittens or puppies.