I believe you...
Several years ago my friend Andrew and I were hiking from Mt. Collins to the Dome and we came across cat tracks in the snow that were as big as my hand. Mixed in with them were deer tracks and you could see where the deer had skidded and changed directions in a hurry. There was also a long mark in the snow that looked like the cat's tail had been on the ground. We are sure that it was a panther that was after the deer. I called the park service to report it and they asked a lot of questions but were noncommunicable about my questions. So, I believe you saw what you saw.