My little yorkie loves to go on walks. But whenever we go on walks I pray that we don\'t run into any other dogs especially big dogs because, my dog just goes crazy when he sees another dog.Snoop once caught me by surprise by jerking away from me on his leash and running up against a much bigger dog while constantly barking, jumping up in the other dogcs face. Luckily the dogs he have aproached have been good dogs otherwise Snoop would be a a little jerky treat by now. How can I stop him from doing this?