Personalized Puppy 3rd Birthday Adult Sweatshirt. I'm three cute puppy. Celebrate your toddler's third birthday with this adorable little doggy. Happy 3rd b-day 3-year-old! Stay warm and stylish with this classic adult sweatshirt, perfect for everyday comfort. Crafted from soft, durable fabric, it features a relaxed fit for added coziness. Whether you’re lounging at home, running errands, or enjoying outdoor activities, this versatile sweatshirt is a wardrobe essential for any season.