18 year old tb is seeing vet today for a back injury discovered Sunday. I'm scared to death because this was sudden, and seems severe. He has a small scraped area on his spine and all I can think is that something fell on him or he slipped on the grass in the rain and went down. An area of spine right over his loin seems swollen and is very hot. He has a large bump on his spine. You cannot touch the hair over his spine or loin without his hindquarters sinking to the ground. No pressure: he can't tolerate you even brushing his hair lightly with your hand!! We aren't talking flinch, we're talking almost collapsing! He stands and walks (slowly) eats and drinks, but cannot stand being touched! Our vet is on vacation, we're seeing the back up vet today. Am I right in thinking this is potentially very serious?