A mouse on vacation
The species with long tail, eyelids, and four sprawling legs is a lizard.
gsthbe
A chair.
A dog has a head, four legs and four paws, a tail, and a nose.
Four. A cat has two front legs and two back legs.
a four legged animal is an animal that walks on four legs, scientifically called a quadraped.
a frog
The fictional animal "Mermaid" is not real They are reputed to have legs on land but when they get wet their legs become a tail like a Dolphin.
A grasshopper
Some have zero (snakes, for example). Many have four (lizards, turtles). I'm not aware of any other cases that don't involve a four-legged animal losing one or more.
The kangaroo is a four-legged animal that cannot walk backwards. Its unique anatomy, particularly its large tail and powerful hind legs, prevents it from moving in reverse. This limitation is due to the way its legs are structured, which is adapted for jumping rather than walking backward.