In order to provide the safest blood products available, all potential blood donor dogs are thoroughly screened. The first test is a blood typing test to determine what blood type they have. At this time, only dogs who are universal donors (DEA 1.1 negative) are enrolled as donors. These dogs have the ability to give blood to any other dog, regardless of the recipient’s blood type. Only about 50% of dogs are universal donors. Some breeds, such as greyhounds and pit bulls, have a higher percentage of universal donors in the population. Once a dog is known to be a universal donor, blood work is submitted for additional typing, complete blood count, biochemical profile, heartworm test, and infectious disease screening (for tick-borne diseases, including Lyme disease). If the donor dog passes these tests, they are enrolled as a blood donor. Bloodwork will be rechecked yearly to make sure the dog is still healthy enough to donate blood.