Very sad and heart wrenching to see these types of things going on around us when we love our little ones so much. The vast majority of YT members have been drawn to this forum for one common connection~the love of our Yorkies. There have been many people that have come to this board out of desperation seeking advice for the simple
fact that a Yorkie is like no other dog they have ever know. I would venture to guess this woman was frustrated and needs help with whatever is going on with this poor little guy.
I am by no means saying that smacking any dog around is the proper way to correct or train because we all know that it is NOT! Reporting her will do no good because seeing someone slap or hit a dog once is not true abuse.
If you were to knock on her door and tell her she was a moron you would get the door slammed in your face. I understand your frustration and outrage but truth be told unless you live right next door to this woman and were able to start a "friendship" with her filled with knowledge there pretty much is no other way to stop her behavior. It really stinks because if this poor little guy is having a housetraining or behavioral issue she is only making things worse by striking him to "train". It's a long shot but maybe you could take yours pups for a nice walk and try to run into her but this idea seems like a loooong shot. What you would like to do and what might work are polar opposites and really there is no good answer to this situation.
I so hate when these types of stories come up.