The exact same thing just happened to Treasure. Clear X-rays after limping. She, too, was diagnosed with a soft tissue injury. She seems much better now, but she was in a lot of pain, as much pain as I had even seen from Phoenix with his osteo. The injury happened at least two weeks ago; I was out of town so I don't know exactly when. She is finally better, but not completely. She still isn't doing stairs, but hopefully that will come soon. Hopefully Stewie will be better soon, also.