If you're looking for a fun way to add music theory and ear training to your lessons and classes, this engaging and flexible activity will bring joy to students of all ages and levels! 
Two colorful 8.5x11 playboards: Playful Pups with toy balls= Major, and Mischevious Pups with muddy paws= minor. 

Use as ear training, with theory games (scales, chords, etc.) and many more uses! PDF file includes both full color and print-friendly formats.