Choose the word which is different from the rest.

The answer is: B. Horse

The other four options are all mammals. Horses are ungulates, which means they have hooves.

• Dog is a domesticated canid which is a member of the genus Canis (canines), which forms part of the wolf-like canids, and is the most widely abundant terrestrial carnivore.
• Cat is a small, typically furry, carnivorous mammal with soft paws, a short snout, and retractile claws. It is widely kept as a pet or for catching mice, and many breeds have been developed.
• Goat is a domesticated ruminant mammal with a beard and backward-curving horns. It is closely related to the sheep and is raised for its milk, meat, and wool.
• Fox is a medium-sized to large, omnivorous mammal belonging to the Canidae family. Foxes are found in many parts of the world, including North America, Europe, Asia, and Africa. They are typically characterized by their pointed ears, bushy tails, and reddish-brown fur.