FTT

Been to see some pups. Bloke says they are 6/16 whippet, 2/16 collie, 4/16 grey, 4/16 bull. Didnt get a pic but they nice looking pups. New to this so asking what you think of the mix. Want her for bushing, racing and showing. Got two kids and the wifes worried about the 1/4 bull as dog will live in the house. Anyone had a problem? Also what height will they make? Cheers, FTT