Not an option, at least, not a no-foolin’-around option. I live in the Mid-Atlantic foothills of the Appalachians, not even remotely Mediterranean. I’m a retired cabinetmaker, guitar- and boat-builder with fifteen years experience as a movie set and prop maker, and I can see that a small portable heated greenhouse (so as to face the sun on my deck) is in my future, as well as Spike’s.
When Rocco was alive there was always competition for food (both 20-pounders, so no shortage), water (continuous drip in the tub) and catnip. Could be that Spike just wasn’t as hot for the ‘nip as his brother was. After all, there was a lot of "I’ll just help my Bro’ with HIS food before I go back to mine."
Well, we’ll see - spring is coming, and perhaps a bunch of pots spread around is what the Vet would order…