Personalized Dog and Mouse Best Friends Toddler Sweatshirt. Friends are always there for you - rain or shine. Dog and Mouse Best Friends Toddler Sweatshirt - Heather features two scenes of this budding friendship from "Dog and Mouse" by Michelle Nelson-Schmidt. Keep your little one cozy and stylish with this soft and durable toddler sweatshirt. Designed for comfort and ease of movement, it features a classic fit with ribbed cuffs and hem for added warmth. Perfect for everyday wear, playtime, or chilly outings, this sweatshirt is made to withstand the adventures of an active toddler