Lovable pets come in all shapes and sizes - from guinea pigs to pot-bellied pigs, dachshunds to great Danes... to chihuahuas that fit in a teacup. Take a tour through the world of teeny-tiny, itty bitty pets.
This pooch, named Tom Thumb, was three weeks old when these photos were taken. An unofficial measurement taken by the owner makes Tom Thumb approximately 6 inches long. The current Guinness World Record holder is a female Chihuahua from Largo, Florida called Heaven Sent Brandy who measured 15.2 cm (6 in).
Dogs aren't the only pets that fit in teacups. This itty bitty kitty was so comfy she fell asleep. But then, where won't cats fall asleep?
Little Thumbelina is the world's tiniest horse. At just 17.5-inches tall, Thumbelina is a pint-sized pony. Missouri's Goose Creek Farms is where Thumbelina spends her days, where they offer tours to see the adorable mini-horse.
The farm says Thumbelina is the same size as their cocker spaniel. The 10-year-old horse weighs just 58 pounds and is in the Guinness Book of Records as the smallest horse in the world.
Hamsters are some of the smallest pets you'll find. Hamster babies don't just fit in your hand, they can get lost in it. A newborn hamster can weigh as little as an ounce.
Hamsters are petite and they've got style! After he's done showing off, this hamster can have his hat and eat it too.
In the same category as chihuahuas, Pomeranians are one of the smallest dog breeds. Pomeranian puppies can weigh less than a pound, and look like little more than fluffy stuffed animals.
Adorable puppy or cotton ball with eyes? You be the judge of this Pomeranian.
Sand cats are one of the smallest cat breeds in the world, and one of the rarest. Don't let the cute kittens fool you, these cats are wild animals. They call the Sahara home, where efforts are being put in place to promote their population by cutting down on pet traffickers.
Not all cute pets are mammals. The Pygmy Chameleon is one of the smallest lizards in the world. These tiny reptiles make wonderful pets, as long as you don't mind feeding them live crickets!
The Pygmy Tarsier is one of Earth's smallest, and rarest, primates. The species was thought to be extinct until 2008, when a team of scientists found the furry creatures on an island in Indonesia.
Probably too rare to ever make a good pet, let's just hope these itty bitty tree-climbers can stick around and make it to next year's cute animal list.