Personalized Cavalier Spaniel Toddler Long Sleeve T-Shirt. KiniArt Cavalier King Charles Spaniel by Kim Niles. (c) Kim Niles, KiniArt - All Rights Reserved 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.