Watch this video. Watch it again. Smile. Repeat.
That dog is Ace, a service dog-in-training. Ace's handler, Sandy, said that they went to Disneyland for a few hours to practice socializing with humans. You can tell that Ace is still in training as he is trying to contain his excitement about Pluto while still following the commands from Sandy. But who cares if he was breaking his commands? This video is just too cute to care.