I went through something similar with Phoenix, my senior girlie (almost 16 now) back in November. The vet suggested steriods, in case it was an inflammation of the spine. The steriods actually worked great, and was able to taper them off in Dec. and she's been fine since then. Appetite with these old guys can be challenging at best, trying to figure out what's appetizing at the moment. She's been on a pot roast with gravy kick for about a month, which is WONDERFUL. Sending lots of prayers to Fred and your folks for much more quality time with their beloved hound.