It is a 'phal-type' dendrobium so it shouldn't lose its leaves but will when it is stressed. These guys like to be decently warm, like plenty of water while growing and temperatures are higher, less when they are not growing and temperatures are lower, and prefer cattleya light. Their roots are sensitive to over-watering so a very small pot with bark/moss or a large one with rock/leca.
The old canes, as long as they are green, will bloom. These are wonderful orchids.