Isn't Geno a rescue dog? He may have had some unpleasant experiences involving moving containers.

Maybe offer a few of his favorite treats as he enters the elevator? We used cat treats quite a bit when our felines first started traveling. Now nothing phases them. During our last long distance trip, one cat even got used to sightseeing in his feline stroller, and he's our shy guy. Just a few cat treats in the stroller and he hops right in.