not sure if i agree with larger/stronger feet as in perhaps theres more to get knocked up,
always ran fell collie grey x bedlington grey medium sized but strong tight feet, if conditioned correctly.
never had foot problems only sore pads if run off course onto tarmac roads on odd ocasion.
all the best y.i.s
Thousands of years of selection has developed large thickly padded, well boned feet on all the rough ground running dogs Saluki's, Afghans, Taigan, Pharoah hounds, Ibizan hounds etc. I'm inclined to believe there is reason for it.
I blame todays racing greyhounds for the weakn