anything smaller than a lion.
A "critter" is slang for "animal", therefore a critter looks like any animal you wish.
Little Critter was created in 1975.
Poor Little Critter on the Road was created in 1984.
critter
Depends on the animal
A Little Salamander-Like Critter
Bridget Erdmann
Lovorambo
A "piglet" is a young pig.
animal, beast, brute, critter, varmint
Bovine, cow, cattlebeast, animal, critter, etc.
An Amphibian