Overnight he developed something called Idiopathic Vestibular Syndrome, which is an inflammation of the nerve between the eardrum and brain. Basically it takes away balance and makes your world spin around like a tornado for a couple-three weeks. And you walk around with a tilted head and run into things.
Very scary night, let me tell you. He went to bed at midnight completely fine and woke up at 4 a.m. unable to walk without falling down, throwing up, peeing all over the house, and both of us in a complete panic. I talked to an emergency vet at about 4:30, but we both thought it was his back. I loaded him up on aspirin and doggy painkillers and waited it out till morning, when it was considerably worse. I started thinking he'd had a stroke because he couldn't even stand up and his eyes looked like he was about to have a seizure. My sister drove down and we got him to my vet who pegged it immediately as the inner ear thing. Apparently this isn't uncommon - he sees half a dozen cases every fall! Did you know about this?? I sure didn't.
When I got him home he wanted to go outside. He ran in circles, falling down over and over again. Oakley thought it was a great new game and romped around and flopped herself down on the ground to play, too. THAT was hilarious!