how does the vet know the nerve is severed? did he get an MRI or have x-rays done? you can't see nerves on x-rays. There are a few people on this forum that have dealt with spinal issues. if i were you, first i'd go and get a second opinion as soon as possible. either have your vet refer you to a neurologist or if that's too expensive right now, go to another vet in town and see what they say. second i'd start keeping your yorkie in a small crate when he's unsupervised. this way he can't hurt himself anymore by moving around and it will promote sleeping. sleep = no pain. if he does have a condition that he can come back from then confinement is key. To express his bladder stand him up with your hards around his waist right before his hip/thigh bones. Easiest thing to do is squeeze his belly up to compress the bladder. Get as much out as you can.
i hope your yorkie can make some type of recovery. a cart would help if he will not be able to regain the use of his back legs. There is a yorkie on here named Baby Bear who uses a cart because of spinal issues and he is doing great. mom's user name is mybabe4me i believe.
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