The shipping cost is very high and the process is extensive; plan on several months start to finish. The CDC rewrote its dog import rules effective August 2024, replacing the old import permit system. Every dog entering the USA must now be at least 6 months old, microchipped, and healthy on arrival, and the importer needs a free CDC Dog Import Form receipt. South Africa is on the CDC's high-risk rabies country list, so a boerboel coming from there also needs documented rabies vaccination on a Certification of Foreign Rabies Vaccination and Microchip form endorsed by an official veterinarian, blood work (a rabies titer from a CDC-approved lab), and arrival at one of the limited US airports with a CDC-registered animal care facility. Check the CDC's current requirements before booking anything, as the details keep changing.
From our own imports: finding flights can take time and be very expensive depending on the time of year and which airlines are accepting dogs. Emirates Cargo was our only option when we last imported, and it is also one of the most expensive; freight alone averaged $5000 per dog. Be prepared to pay more when you pick the dog up, and to clear the dog through Homeland Security Customs and bring that paperwork back to the shipping company's delivery bay. All in, an imported boerboel typically lands at $8000-$12000+ once you count the dog, freight, vet work, and fees.