Yorkshire Terriers consider themselves big dogs and will always fight a big dog if they are allowed to. Keep your Yorkie under control. Better yet, start socializing your Yorkie early by taking him to dog school.
#1 Yorkies tend to retain their puppy teeth, especially the fangs.
#2 Check his teeth more often when your puppy is about five months old.
#3 If you notice a second tooth trying to grow through but the baby tooth is still in the mouth, take it to your veterinarian.
Stuck baby teeth can cause the second teeth to grow crooked, which can later lead to tooth loss.