I grew up in Cape Town (many years ago) - beautiful city.
I'd suggest contacting your local bulldog club, as they will presumably either be aware of or be able to suggest the best means of transport -
http://capebulldog.freeyellow.com/I'm no expert but I think there is always some risk in sending bullies by air; however most go okay.
This seems to be a professional body of pet transporters -
http://www.ipata.com/Veels geluk - jou bullie sal die sneeu geniet! (Best of luck - your bullie is going to enjoy the snow!)