Personalized I'm Six Years Old with Dog and Mouse Adult Hoodie Sweatshirt. Celebrate your birthday with Dog and Mouse, the unlikely best friends from the children's book "Dog and Mouse" by Michelle Nelson-Schmidt. I'm Six Years Old with Dog and Mouse Adult Hoodie Sweatshirt - Black, perfect for young readers, helpers, and great friends on their birthday. Elevate your comfort with this classic adult hoodie, a perfect blend of style and practicality. Crafted from soft, high-quality fabric, it features an adjustable drawstring hood, and a spacious front pocket. Ideal for layering or wearing on its own, this hoodie is a versatile staple for casual outings, workouts, or relaxing at home.