Out of all the breeds, why choose the most vicious ? What does this really say about the owners ?It would be like choosing a tiger for the "family cat".
There was just published a study (I can get the reference if you need it) that people who choose dogs who have bad reputations (Pit bulls, rottweillers, dobermans etc) are far more likely to have criminal records or be addicted to drugs or alcohol.  \n\nIt supports the idea that there are no bad dogs, just bad owners.
First of all you have to find out if your dominant trait (white coat) is homozygous (WW) or heterozygous (Ww). Your recessive trait has to be (ww)(b/c both alleles must be recessive in order for the black coat to be expressed.) After you find this out you can use a Punnett Square to plug in your information and find the outcome. This site will step you through drawing a punnett square step by step. http://www.borg.com/~lubehawk/psquare.htm