World’s Smallest Dog: 12.4 cm (4.9-inch) tall
Ducky, a yappy short-coat Chihuahua from Charlton (Massachusetts, USA), holds the Guinness World Record for the world’s smallest living dog (by height). He weighs 1.4 pounds and is 4.9 inches tall. Ducky eclipsed thr record of Danka Kordak of Slovakia, a Chihuahua who’s 5.4 inches tall. Nonetheless, the smallest dog ever, as per Guinness, was a dwarf Yorkshire terrier who stood 2.8 inches tall.
World’s Smallest Snake: 10.1 cm (4-inch) long
Just look at the world’s smallest species of snake: Leptotyphlops carlae. The adults of this genre average almost under four inches in length. Inhabitant of the Caribbean island of Barbados, the species –which is as thin as a spaghetti noodle and small enough to rest comfortably on a U.S. quarter– was discovered by Blair Hedges.
World’s Smallest Fish: 7.9 mm (0.3-inch) long
Check out the world’s smallest fish — a member of carp family of fish — the Paedocypris progenetica. Discovered on the Indonesian island of Sumatra it’s world’s smallest backboned animal; only 7.9 mm (0.3 inches) long. However, she has a couple of contestants: 6.2 mm (0.2 in) long male anglerfish Photocorynus spiniceps (not technically a fish but a sexual parasite) and the 7 mm (0.27 in) long male stout infantfish Schindleria brevipinguis.
World’s Smallest Horse: 43.18 cm (17-inch) tall
Meet five-year-old Thumbelina – the world’s smallest horse. Born to Paul and Kay Goessling, who specialize in breeding miniature horses, she weighs 60 lb and is 17-inch tall. Sounds unbelievable!
World’s Smallest Cat: 15.5 cm (6.1-inch) high and 49 cm (19.2-inch) long
Have a look at Mr. Pebles, of central Illinois. Declared the smallest cat in the world he weighs about three pounds. Guinness Book of World Records verified his small stature in 2004.
World’s Smallest Hamster is One of The Smallest Animals: 2.5 cm (0.9-inch) tall
PeeWee is the smallest hamster in the world, and is literally a little bigger than a 50p piece. This golden hamster stopped growing when he was three weeks old, and presently weighs less than one pound.
World’s Smallest Chameleon: 1.2 cm (0.5-inch) long
The world’s smallest species of chameleon — Brookesia Minima — is just half an inch. Found on the rainforest floor of Nosy Be Island off the north-west coast of Madagascar, the species females tend to be larger than males.
World’s Smallest Lizard: 16 mm (0.6-inch) long
Its smallness can be gauged from the fact that it can curl up on a dime or stretch out on a quarter. The species scientific name is Sphaerodactylus ariasae and it’s about 16 millimeters long, or about three quarters of an inch, from the tip of the snout to the base of the tail. It shares the ‘honor’ with another lizard species called Sphaerodactylus parthenopion, discovered in 1965 in the British Virgin Islands.
World’s Smallest Cattle: 81 cm (31-inch) height
A rare cattle breed of an Indian zebu called the Vechur cow, its average height is in the range of 31 to 35 inches (81 to 91 cm). The picture you see here shows a 16 year old Vechur cattle as compared to 6 year old HF cross-breed cow.
World’s Smallest Seahorse: 16 mm (0.6-inch) long
The creature, dubbed Hippocampus denise, is typically just 16 millimetres long – smaller than a standard fingernail. Some of them are merely 13 mm long. H. Denise habitat is the tropical waters of the western Pacific Ocean, between 13 and 90 metres beneath the surface. (Source)