Besides us, what other species has the potential to conquer the world?

I was looking at my dog just right now and she seemed so pensive… She is sitting on the floor and is looking in all directions. I wonder if she is bored out of her mind just sitting there! Then, it occurred to me: I bet she has a pretty good understanding of her surroundings. She recognizes faces, knows when her food is ready, understands the basic things I tell her… in short, she’s pretty smart and I think some of use tend to underestimate how smart other species can be! Ignoring for now our imagined self-importance, if we weren’t as smart as we believe we are… what other species do you think would have the brains to build themselves something that suits them… something that makes them rise above all other living things on the planet?
I think dogs are a good candidate, and I have no problem imagining my dog as a canine leader!