My 12 week old puppy was under a chair trying to get to some cables. I tried calling him out calmly and firmly but he refused. So I then bent down and placed my hands gently on him to guide him backwards away from the cables. At that point he growled aggressively and turned round twice to bite me on the arm. My puppy is treated exactly the same as the five other dogs we’ve had before him and I don’t know what to. I’m really worried that this is the start of true aggression in him.