He's 8 months old. If you are becoming afraid of him, he is only going to get bigger and stronger.
One problem I see is that you are drawing away to avoid getting bitten. This is rewarding your dog's aggression toward you. He is successful, with that behavior.
Generally it is better to take the dog away from the thing, rather than the thing away from the dog. For example, if there is a broken plate of grapes on the kitchen floor. Don't try to pick up the plate and grapes, put a lead on the dog, and lead him away and crate him, then take care of the mess.
Well, sometimes he will have it in his mouth. You can teach him with hot dogs the command, DROP IT! Make it a game. At first, give him the treat every time he drops the object -- start with something not too exciting, a squeak toy, or a rope toy. Good Drop! praise and treat. Make it a game, make it fun. make it lucrative for the dog.
Now, make it harder. Start using different objects -- nothing better than the hot dog, not yet. But a variety of different things. And start phasing the treats so that he gets one every other time or every third time, and eventually, only when he drops it quickest. And have him drop it, and then walk to you to get his treat.
Now you have trained him to leave the object and come to you for his treat. you can snag his collar and give him a tid-bit, and then crate him so that you can deal with whatever he has dropped for you.
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