if your looking to do foxes i wouldnt go for a collie grey,unless you can get a pup from decent foxing parents,hard to get a good collie on foxes these days,id go for a collie/bull/grey or wheaten grey or some sort off mix off them,would be your best option pal.
Collie/Greys on fox were common before the ignorance and prejudice of the ban,i truly cannot fathom how anyone ever knacked a fox with a lurcher before the infusion of Bull,Wheaten crept into the breeding programmes,yes some of them make for more than useful jukels,there was more than useful jukels of Collie heritage wasting fox,s