New Zealand Law
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She can be sued for defamation. This was careless at the best and he would be entitled to bring a claim for the damage to his reputation. Usually this starts with a letter from a lawyer asking her to retract and apologise or she will be sued. If she refuses then he could bring a claim in the District Court and may have to pay damages and costs
This isn't a crime but could be a privacy issue where he could make a complaint to the Privacy Commissioner
If he can be identified by photo then he can still claim for defamation
You can make a case that it is obvious who this was intended to defame by the groomer, because if you get someone to say that he was easily identified, then that would be enough to make a court case for defamation. If the post clearly is about him, and she placed this post, she will be liable