When you woke up, you took off your retainer. Usually, you put it in its case or in a drawer somewhere, but you forgot and placed it on the table beside your bed. Then, after you left your room to go to the bathroom (you brush your teeth and take a shower or something), your dog enters your room and sees your retainer. Then he decides to pick it up from the table using his mouth and eats it.
My dog ate my container and it’s true, but no one believes me. I had just woken up and I was in a hurry to get to school, so me being clumsy I forgot my retainer. As soon as I came home I went to my room and what do you know? My dog was eating my retainer!
The description that would improve the setting in the passage above best is "Eating dinner one chilly evening, my master and I...". Because it will set the mood of the retelling of his master's story.
