I believe that orange is also called red in some breeds
the genetics would be
A_ B_ C_ D_ ee -agouti, black, full color, dense, non extension
tort is
aa B_ C_ D_ ee -self, black,full color, dense, non extension
chestnut is
A_ B_ C_ D_ E_ agouti, black, full color, dense, extension
The _ in each notation is "unknown" so if the chestnut carries the recessive "e" gene with its "E" gene then half the kits would be orange. If not,then the kits would all be chestnut [if all the other genes are dominant. If not, there are other possibilities.]
Hope that helps answer your question,