People sometimes mistakenly create behavior problems just because they don't understand how dogs/puppies behave naturally and also how they think.
Some doggy body language is simple and once known can help you understand your Yorkie better.
Keep in mind that failure to communicate can contribute to behavior problems simply from lack of understanding each other. By learning to speak your dogs language, you can compromise and meet your yorkie at the half way point.
A Wagging tail and the lowering of his/her head upon greeting is a sign of submission.
A lowering body, tucked rear, urination, and perhaps even rolling over is a sure sign of extreme submission. SUBMISSIVE DOGS especially young dogs may urinate upon greeting someone. the dog should not be scolded for this. Submissive urination is usually outgrown as the dog gets older and gains more confidence and trust. Greeting your dog with excitement or yelling or leaning over the dog does not help this situation and should be avoided.
Drooling and panting can indicate an extreme nervousness.
Yawning does not always mean tired as we would think, It can be a sign of nervousness.
Exposure of the teeth, raised hackles, an upright position, stiff legs and direct stare indicate dominant behavior, such as standing their ground.
elbow on the ground and their hind quarters in the air, is a classic "want to play" position and is a call for you to play a game such as catch,fetch.