Pomeranian (Detailed Introduction)

　　Dog blood types are much more complex than humans and have different naming conventions. Currently, dog blood types are classified by Dog Erythrocyte Antigens (DEA). Scientists represent different surface antigens by numbers, divided into types such as DEA1(-), 1.1, 1.2, 3, 4, 5, 6, 7, 8, etc. Among these, DEA1(-), 1.1, and 1.2 are the most common and also require the most attention. Testing a dog's blood type is similar to humans: first, blood is drawn, then dropped into three different wells. Special reagents are added, and after a moment, small clots appear, allowing the identification of the dog's blood type.
　　Because dogs have many blood type varieties and the purity of proteins in different blood types is not as pure as in human blood, dogs receiving their first transfusion will generally not have rejection regardless of blood type. However, a dog can have only two types of blood at most, so when receiving a second transfusion, it can only accept blood of its own type or the type used in the first transfusion. Even dog breeding must consider blood types; otherwise, random mating may cause puppies to suddenly die after birth.