Dog Training Job - Fish Hoek, WC, 7975

We have a six month pitbull cross puppy and he does not listen or come when called. We did 3 sessions of puppy preschool but he was older than the other puppy's and often dominated over them (being bigger) and caused anxiety for them so we stopped going. He jumps up on people and nips etc. He opens the gate and runs down the road, or once the gate is secured he'll wait for guests to arrive and when we let them in he runs out. We have another dog too but because she keeps trying to go for the cat we keep her outside the back until bedtime. She is 9 so it isn't kind to her but we aren't sure she's attainable. She's not half as disobedient as the puppy though.