How long does it take a puppy’s anemia to heal?

Mild puppy anemia can be improved with pet-specific iron syrup, usually in 1 to 3 courses of about a week each. Severe anemia needs a blood transfusion. Puppies easily become anemic, mostly because nutrition cannot keep up with growth; they have little iron storage and need more during growth, so low-iron food slowly causes iron-deficiency anemia..