At times during our leash walks, Ivan gets a burst of energy and starts nipping at my heels. He doesn't do it hard, but it's an unacceptable behaviour and i'm afraid if his excitement keeps escalating he might hurt me. Especially since we're still getting to know each other and build trust between us, I still don't know him 100%. Then he decides to start tugging on the leash like a game of tug of war. Since he's a big dog, i'm having a hard time controlling him when he gets like this. He's very different from all my past fosters, so I need to tread more carefully with him. I sent an e-mail to a local trainer but still waiting for a reply. In the meantime what can I do to get him to understand this behaviour is unacceptable? I don't have a fenced in yard, and it won't be going up until hopefully the spring or summer (pending weather/rain). I'm trying to find a fully enclosed (and private) place I can take Ivan to to run off-leash. On anotehr note, Ivan came out of his crate by himself today!!!!!! Whoo hoo!