Rainy Days Make Me Happy! I remember as a child in school looking forward to rainy days as it meant recess was cancelled and we were allowed to play fun games in class. Remember “Heads Up Seven Up?” Your dog may miss out on their daily walk on those rainy days but they can be just as enthused as me in grade school. Here are some things you can do with your dog indoors, when exercising outdoors isn’t an option: 1. Mentally stimulating games