As nouns the difference between amir and dog

is that amir is alternative form of lang=en while dog is a mammal, Canis lupus familiaris, that has been domesticated for thousands of years, of highly variable appearance due to human breeding.

As a proper noun Amir

is a given name derived from Arabic.

As an acronym DOG is

digital on-screen graphic.

As a verb dog is

to pursue with the intent to catch.