Instead of trying to decide which one is the best option, this yellow lab manages to fit all three balls in her mouth at the same time. Reminds me of prom night.

The video description on YouTube says the dogs name is Zoe. It also says Zoe "is very smart and picks up 3 tennis balls at once". I don't know about smart. I'd lean more toward too lazy to make more than one trip. Either way, it's pretty entertaining to watch. Be sure to stick around until end.