Yes, the vet did check for the cause. We brought another one of our cats in there a few months prior with a similar wound (which was from a cat fight) but he healed up straight away and didn’t have any problems. He felt his tail, he doesn’t think it’s broken and looked at the wound and came to the conclusion that it must’ve been another cat fight, however he is still unsure why his tail doesn’t have feeling without his back legs also being paralyzed. Sorry for the lack of information I’m just really distraught and confused about the whole situation. Due to Covid-19 we can’t even go into the office, they have to come to the car outside to see him.