Our vet was able to see us sooner so we went there last night. After examining Pebbles she believes she has pulled a muscle and the pain is mostly on her elbow. The vet said considering her age, shape and the fact that she is always on antiflea/tick medication its is very unlikely to be anything major or lyme. Pebbles body temperature was also normal and she didnt have any other symptoms that could point to an infection. But if she doesnt get better in 2 weeks or so we will test her for lyme and do X-Rays. For now, no long walks and stairs for miss Pebbles. I hope she gets better soon. Sucks that this happend right when we wanted to start agility. Booo