As had been said feathering is a recessive trait when compared to the smooth coat. I doubt however that it is as simple as a single loci gene (ie one pair or two genes) I suspect it is a slightly cumulative trait. This is because you can and do get degrees of feathering. To be honest know one really knows the exact properties of the gene. Colouration is the one that has the most information about.
There are a number of breeds of dog that do/can exhibit feathering. Salukis as you've already got; also, collies, setters, pointers etc
If you had the time and resources you could breed