Oh Sarah my heart aches for you. There are unfortunately no words to say at times like this. When my shih tzu passed away 7 years ago I was unable to function as she was my only dog. I couldn't even hardly get out of bed. Shortly after we got another shih tzu within a couple weeks. He didn't replace her at all--totally 2 different personalities but it might help you with another since you've already paid etc. Only you can decide that though. I'm am so deeply sorry this happened.
Linda, Georgia, USA
Winston--shih tzu-male, Darby female tri, Bentley male blenheim and Chelsea, black-tan
Abbey my beloved tri who is so embedded in my heart--RIP Sweet Princess