As nouns the difference between dog and crocotta

is that dog is a mammal, Canis lupus familiaris, that has been domesticated for thousands of years, of highly variable appearance due to human breeding while crocotta is a mythical dog-wolf of India or Ethiopia, said to be a deadly enemy of men and dogs.

As an acronym DOG

is digital on-screen graphic.

As a verb dog

is to pursue with the intent to catch.