Personalized Westie Halloween Cat Toddler Long Sleeve T-Shirt. Westie Terrier dog in a Halloween cat costume; art by KiniArt, (Contemporary PUP Artist, 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.