It's been views more than 3.3 million times.
The two-minute spot, created by Thai bank Kiatnakin, follows a dog's determination to pay back a stranger for providing him food. It shows a series of scenes where the dog enthusiastically guards the man's vehicle.
However, it's the final scene that brings everything together (we won't' spoil it for you).
Kiatnakin Bank said in the video's YouTube description that the ad is meant to highlight the unexpected returns of investing.
"Investments appears to be an ordinary savings, but actually returns have exceeded expectations," it said, according to a Google translation.
Follow Oliver Darcy (@oliverdarcy) on Twitter