A giant snail or snake. Probably a snake (I voted snail because I forgot to weigh my options. ). If it was a hostile snake, then I'd pick a snail. It'd wax my floors, at least.
Probably a giant spider. Tarantulas seem pretty cool to have as pets. Snakes are probably nice too, but they get too big while tarantulas can only be about a foot long.
can it be a giant daddy long legs spider? if so i'd choose that. a snake would probably eat me and a giant snail would make me barf from all that slime