My dog is now between 13 and 15 years old and about 3 years ago had the same symptoms. It was so sad, she could not even stand to eat or potty! I thought it was time to say goodbye and took her to the vet crying because I thought I knew what he was gonna say. Boy was I wrong! He gave her a steroid shot and put her on tri buffered aspirin for the arthritis in her back and she has been fine ever since! Now when she starts moving slow, which is not very often, she goes on aspirin for a few days and is better! It is amazing. She is still such a joy, and still has many "puppy" aspects about her. (Thanks Doctor Jon! Buffy loves you and so do I!)