Blood transfusion for animals has to be authorized by a certified veterinary doctor before permission is granted to access the blood bank. There are various blood banks spread across a myriad of states in the U.S. Most of them operate as non-profit institutions.
The Association of American Veterinary Medical Colleges asserts that the nation has a mere 30 vet schools where over 3,000 students graduate every year. It is not easy to be admitted in a school of veterinary medicine. Medical students in the U.S. are many, but this specific field requires rigorous vetting and high grades for one to be considered a bona fide student of any vet college.