I'm not sure who these guys are. The dark elvish guy is a kinda elf-Tarzan crossover, but when I first drew him I think I had a drow/water spirit halfbreed in mind. Yes, I know, I'm wierd.
Anyways, the thing that gets me thinking the most about this pic is the fact that the big rat-demon-dog thing isn't randomly attacking that elvish dude... think of it the same way a dog reacts to a person who gets too close: he barks, growls, and bears his teeth. Basically he's just telling you to go away. I suppose the same thing is going on here. Afterwards, I'm sure the elf will just keep going his own way, and the...uh... dog will go back to whatever he was doing before.