If it were me, I think I'd look into pressing charges or some recourse against her. You know how I feel about using dogs to make money

but you could use this against her... honestly, she technically could have just "cost you money" by shaving your dog. You just bought him...I don't know what you paid but you obviously paid for a show/breeding dog right? Well, she just cut off his hair and ruined his chances of being shown. Also, some people don't want to buy puppies if they haven't seen pictures of the parents in full coat...so technically cutting his hair off might potentially cause you to lose puppy sales. I mean honestly, probably not... but she definitely ruined his chances of being shown if that's what you were going to do. I really think she could be held liable for some kind of monetary recourse...
I know this is extreme... If it was an accident and she was honestly sorry then no I wouldn't go this far...I would still be PISSED and probably never speak to her again.. But in this case, she has no remorse and I think she knew what she was doing. I'd definitely make sure she paid for her mistake. LOL I guess you can see how pissed I am for you...
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.