Unfortunately for Japanese residents looking forward to see their pizza delivered on the back of a reindeer, the plan had to be scrapped. They put out a video showing why:
What it boiled down to is: the reindeer were too difficult to control. In certain countries, including Japan, Domino's lets you track the status of your pizza delivery via GPS. They even came up with a reindeer icon for the promotion. But, as you can see in the video, with the reindeer, there's a chance that your pizza delivery might start weaving around in circles not unlike a drunken sailor in a storm. And that's only what happens on a empty test track at a driving school.
With the reindeer plan being shelved, they're left with decorating some of their delivery cycles to look like reindeer with antlers and the like.
Here's a longer video of the reindeer training in-progress:
Photos via Domino's Japan.