Occasionally cats have been injured by munching on the wiring to electrical cat bed warmers, so I got a disk that can be heated in the microwave. Five minutes and it warms for 8+ hours... It feels like a softish plastic coat and I slide it into a fleece cat-sized "pillowcase".

Both my cats like the doctored for cats milk products out now: LapHappy and CatSip are two brand names. It's milk that's had the lactose removed and ... another item added for cat health. I think it's Taurine. KAK and I were talking earlier today: my cats love it and hers do NOT. But it's worth a try.

Does your cat still enjoy catnip? You could try growing a plant for him, or perhaps cat grass. It aids their digestion and both of mine perk up when I bring a fresh batch in.

Good luck! Please let us know which treats you decide on.

[Oh, T&PM -- your dad's bench is ADORABLE. Please let him know his handiwork's made him a fan out here!]