Welcome to YT, I do hope you are using a harness and not a collar. I suggest taking her to training school, they will teach you the tools you need to know so that you can properly train this pulling out of her. At one time I had a pack of 3 yorkies, all 3 years apart and all walked at the same time, all did the same crazy pulling but not to the extent of your little one that is so exhausted they are calm on the walk home. I could never train them not to pull so walks were not a pleasure for me lol.
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