Why did the dog stay in shade?

This sounds like the start of a riddle! To answer, we need more information. Here are some possibilities:

* It was hot: The most obvious reason a dog would stay in the shade is to avoid getting too hot.

* It was playing hide-and-seek: Maybe the dog was playing a game and chose the shade as a hiding spot.

* It was feeling shy: Some dogs might prefer to stay in the shade if they are feeling timid or shy.

* It was protecting something: Maybe the dog was guarding something valuable in the shade.

Tell me more about the situation, and I can give you a better answer!