Best Cat Dad In The World. Get your Cat Dad merchandise here. We will be adding lots of designs to this section, so please check back often. Do you know the world's Best Cat Dad? Maybe YOU are the World's Best Cat Dad? Well, now you can get special custom Cat Dad t-shirts, mugs, stickers, buttons, magnets and more. Check out our gallery and even customize the items you want by moving the image around and adding a name! Design has cat paws, a big read heart and is full of love.