[Nancy1999]

I don't think you should ever hit them, even a tap to the head. I guess with some dogs they think you have to do that to get their attention, but most will give you the attention without hitting. Many people have found success using an aversive noise, a clap will do it with a young puppy. For an older puppy, if you put some pennies in a can or a "tin" and shake it, this sound is usually enough to get their attention. Always say the word "no" first, and shake the can. The word "no" becomes associated with something bad, and has more meaning. Don't overuse the word either; pick your battles. I didn't really need to use the pennies in the can until Joey was older, 6 months or so, and this is very effective in reducing barking.

For wires, I would try to hide them, it could be dangerous. Make sure they have plenty of good things to chew on.