Moving with my dog to South Africa 🇿🇦 from USA🇺🇸

I really need to know, is it necessary/compulsory for my dog’s blood to be tested for diseases all the freakin way in Japan and Belgium?? It says testing at an OIE REFERENCE LAB? What is the reason for this? It’s so expensive. What could possibly be so scary from a healthy American dog? I’m so annoyed 😒, can someone please make me understand this cruelty to animal parents👎