Seven golden rules for training a dog to do or not to do something:

Communicate
It is up to you to continuously talk to your dogs. Let them know when they are doing something right and when they are doing something wrong. The proper way to communicate is with commands, corrections, and praise — always in that order. Use a training correction for something your dog doesn’t know yet. This is a correction that passively and physically shows your dog the behavior. Use food only for the first few repetitions. Once you know that your dog understands the command, you can escalate to a firmer correction. At the same time, gradually increase your dog's distraction. A common mistake is to train the basic commands at low levels of distraction and then expect your dog to immediately listen at a higher level without a gradual progression.

Teaching
If you are not teaching the right thing, you are teaching the wrong thing, because you are always teaching something. Most of all problem behaviors are inadvertently taught and reinforced by their handler. Always be aware of what it is you are teaching.

Leadership
You are the leader. Your dog is the follower — there is no room for equality in your relationship. Dogs are pack animals and no two in the pack are equal. It is important to establish yourself as a leader or the "alpha dog" early. One of the common mistakes made with toy breeds is the "cutesy factor” when a toy breed is treated like a stuffed toy instead of a dog. Toy dogs need direction and discipline as much as big dogs.

Consistency
Be consistent with your commands and demands.

Right & Wrong
Your dog often does not know the difference between right and wrong behavior, so don't assume that he does.

Understand
Make sure your dog always knows and understands why he is being corrected. You cannot train the right behavior by correcting the wrong behavior. You must take the time to train the right behavior with reward and training corrections before you give correction for a bad behavior.

Reward
Always reward correct behavior.