A humane society tries to stop human or animal suffering due to cruelty.
Yep. I've done a little work for one. Mostly caring for animals. What about you?
I haven't. In most countries, it's cruelty to animals that they're preventing.
Are there any animals in particular they focus on protecting? Pets? Livestock?
Differing laws concerning animal cruelty occur in different jurisdictions.
I see. What countries would you say have the most active human societies? 
The first humane society was based on the British Royal Society for the Prevention of Cruelty to Animals.
Oh, that's cool. Are humane societies publicly funded? Or supported more by private donations?