As nouns the difference between dog and pasta

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 pasta is (particularly in Italian cooking) Dough made from wheat and water and sometimes mixed with egg and formed into various shapes; often sold in dried form, it is typically boiled for eating.

As an acronym DOG

is digital on-screen graphic.

As a verb dog

is to pursue with the intent to catch.