Summarize this article:

To find the right Yorkie, you need to see how they act with their siblings. Check the puppies for shyness. If 4 out of 5 puppies run away or act afraid of you, they may have a genetic predisposition for shyness. Odds are the 1 brave puppy has the same genetic coding, so you should look for the perfect Yorkshire Terrier in another litter or with another breeder.  Watch the puppies play with each other. Normal puppies are curious, friendly, and like to play. Look for warning signs: is the puppy anxious? Fearful? Aggressive? Ask the breeder if you can spend some time with each of the available puppies individually. To find the right Yorkie, you need to make sure the puppy is healthy and evaluate how they act when not surrounded by their siblings.  Inspect the puppy's fur, eyes, rear end and ears. A healthy Yorkshire Terrier puppy will have clear eyes, a clear nose, a shiny coat, and clean ears. An ill puppy may have a matted or shabby coat, discharge, a cough, a potbelly, and dirty ears. Test the puppies' hearing. Make a loud noise and see if the puppy reacts. A puppy with good hearing will react right away and then become curious about what caused the sound. Puppies require frequent vet visits for vaccinations and checkups in their early months. Have the puppies already been treated for heartworm and parasites or been given their vaccinations? If not, you will have to pay for all of those procedures out of pocket. Remember that you are choosing a Yorkie puppy, the puppy is not choosing you. If you select the puppy that runs right up and jumps all over you, you may end up with the most energetic puppy in the litter, and have regrets later on. Choose the puppy that has the best personality and is not too bossy nor too timid. A Yorkie with a good nature will wag its tail, not bully its siblings, and not growl or bite. Do not choose a puppy that has any behavioral or health concerns.

Summary:
Visit with all the puppies in a litter. Assess each puppy’s health. Ask about the litter’s medical history to this point. Choose your puppy.