Human who was treated like dog he didnt had a name or purpose in life you bought him, taught him how to speak and tamed him

he goes wherever you go and do whatever you do even though he is a human he is loyal like a dog

the two of you are in a meeting everything went wrong and you got attacked of course your loyal dog Rex attacked them back and didnt let them hurt you..

you two were about to leave but you saw enemy aiming gun at rex so you shield him and then bang he looked at the person who shot you he had pure rage in his eyes

then he went to you immediately picked you up and runned to closest hospital

...