Personalized Muggles And Mom Westies Toddler Long Sleeve T-Shirt. Muggles and Mom west highland white terrier art from the children's book MUGGLES' NEW HOME by Kim Niles. 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.