I used to run a first cross he was out of Thorn the same sire as Axel, he was a black dog with a bit of white on toes, tip of tail, and chest i think, but the bitch out of Axel and the first cross bitch was equally black and white, Omanyra says this is to do with the genes, and only happens when you put deer x grey back to deer x grey
When you are breeding first cross deerhound x greyhound, as with any F1 you lock away the recesive genes, but, they will manisfest in the second generation, whether you put the dog to another first cross, or any other dog/cross.
The dominant colour in deer