The term 'Little Litter Critter' is composed of three words: 'RUNT' (4 letters), 'PUP' (3 letters). RUNT is a term used to describe an animal that is smaller than the average size of its species, usually due to being the youngest or smallest in a litter. PUP is a term used to describe a young dog or other animal. Together, these two words form the phrase 'Little Litter Critter', which is used to describe a small, young animal, usually one that has recently been born.