You have to be careful typing in symptoms on google, for you, or for the dog. I had myself all worked up when I hurt my knee about a year and a half ago. I was sure I would need surgery, as it was seriously messed up, and there were two possible problems, one was the correct one, a torn quadriceps tendon, and the other one, another tendon where the surgery is much more involved. I had myself convinced it would be the worse one that would have to be done, and when the doctor said, "I'm pretty sure you tore your quadriceps tendon, and have to have it fixed tonight!" I was very relieved. Other than a couple of hours of pain right after the surgery, it wasn't bad at all. I did find out that not only doesn't morphine in an IV do much for me, I have a huge tolerance of it. They gave me several doses of it, and I didn't even get drowsy. They gave me a percocet though, and I was gone.