i think sume bull crosses can run sume cant.i had dog sume years back and when he ran its like he swang hes back legs out to the right.he did get faster when he became a adult dog but hes way of running was still much the same.he became a good fox dog but no good for deer never had the speed.its all most like sume bull crosses have hip broblems.just hang on to him see how he turns out he should cume good for you in the end.