Thanks for the input guys.

Chloe turned 6 in January and is a Papillon/Sheltie. My vet said she may be predisposed to some back and hip problems so there could be something underlying there. The x-rays and testing are scheduled for Friday...we just ran bloodwork last Monday, so I'm not sure we'll do that again since the symptoms haven't changed. We'll see what the vet recommends. I just hope she shows them whats wrong this time instead of being the "tough girl" that she is.