I am at a loss…literally

My birthday was this weekend and I went to Vancouver to celebrate with friends. The day after I left my dog sitter informs me that she lost my dog. I am livid. I am sad….and asking myself how I want to feel or what result I want is not working for me right now. What I want is my dog back. She is my friend and I love her. I miss her so much. So what do I do?