Jamiexx

Hi looking for some advice plz. we recently took on a staffy pup he’s just turned one in August. We’ve had him for around 6/7months now and recently we’ve noticed when he is being told no or told off for something if he’s chewed etc ...he has starting growling and snarling at us- one time to the point of him showing teeth at us. Does anyone have any ways of stopping this or what to do because it if carry’s on we won’t be able to keep him.