you need to give them time to get used to each other. Make sure your older yorkie still feels loved. If she has a favorite toy or treat only give it to her when the puppy is around. Make good things happen when the puppy is near so she associates good things with the puppy. Often older dogs do not really have patience for rambunctious pups. It took about 6 months when I introduced a puppy before my older dog would even play with her at all.
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