Personalized Dog Toddler Long Sleeve T-Shirt. What a good pup! Dog Toddler Long Sleeve Tee - Red from Michelle Nelson-Schmidt's children's book "Dog and Mouse" is looking for a friend that's loyal and true. Could it be you? 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.