Personalized Jack Russell Terrier Dog Gifts Toddler Long Sleeve T-Shirt. Jack Russell Terriers are oh so cute and this fun design says loved by a Jack Russell. 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.