I dont think it was ignorant?
It is true that yorkies sometimes have bad knees. If she had said that yorkie were ugly so she wasnt interested in owning one i could understand it. It was an opinion. And i have a feeling if she had known she hurt your feelings she would have apologized because i do not think it was her intention. we are after all, only human. Im sure all of us have said something that offended somebody but we didnt mean to. I wouldnt personally want a Irish wolfhound because they have a very very short life span (6-8 years) And I am not interested in losing a dog so early.