What If Cats and Dogs Had Opposable Thumbs Day is observed every March 3rd and encourages pet owners to imagine how life would change if their furry companions had opposable thumbs. Founded by Ruth and Tom Roy, this whimsical day prompts reflections on the antics pets could engage in, such as opening their own food tins or causing mischief. Typical customs include watching pet-themed movies, dressing pets in silly costumes, and engaging in imaginative activities, like writing stories from a pet's perspective. The day aims to celebrate the bond between pets and their owners while providing a humorous way to appreciate the simplicity and joy pets bring to our lives.