What is the economic goal of the Humane Society?

I regularly volunteer at the Humane Society, but for Economics I have to turn in a paper describing my volunteer work. One of the questions is, “What economic goal is being achieved or addressed by this service? (most fulfill equity or efficiency.)” I don’t understand what either of those things mean in economics and I have no idea what to say. Definitions of the two applied to my situation would be very much appreciated.