I have to agree with foxtrot to us all foxes smell the same but to a hound im sure they can tell the differance scent to each fox and not just that there nose is that tuned that I bet they can tell differant information about individual foxes ...sex..young or old ...fit or poorly etc etc
I dont think anyone can give a deffinate answer but only theories but the way I see it is our main sence is our sight so if you go and look out your window for a few seconds the amount of information your brain takes in is vast for such a small amount of time .....so with a k9s main sence being smell the amou