well said mate, i have a 1/4 bull with a 1/8 collie and she has done 3 or 4 day time ones and 2 of them were one after another with no rest, shes the racey type though, but i would say a half cross would take them it just depends on what the dog takes to the gray or bull and how fit the owner keeps it
any pics of the dog mate??????????????
nice one
cheers