Personalized Dog Day Monday Toddler Long Sleeve T-Shirt. Monday text with an image of a sad puppy is a humorous design for the beginning of the week blahs. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.