Errrgh. So Rex is experiencing his first bout of back pain. I knew this day would come, but I was hoping not so soon! He's almost 7. I got a new bed and it's higher up, and he's just jumping on and off it constantly. He has a step that he uses to go up, but not on the way down. So he might just have to be crated at night, which really sucks. He doesn't understand why he has to be in a crate at night all of a sudden. I didn't realize how much jumping he…