To make Dot do an animation, click her. To make her drink water, click the glass of water. To feed her, click the muffin. To play fetch with her, click on the ball and move it anywhere you want to. To let go of the ball, press the space bar, and Dot will pick it up. This will raise her Affection by one. If Dot's Thirst or Hunger gets to 100, she will die, and if her Affection reaches 0, she will hate you and the world will end.
This is my third virtual pet. I got some of these ideas from a Scratch tutorial video.