I am currently having issues with this too. My Smaug has been very docile and doesn't mind being handled. We have had him for 5 months, he was given to us by a friend so we are not sure exactly how old he is. He weighs 566 grams/24 ounces. His husbandry is good. I have done the research on that. Just the last few days he has been super aggressive. We fed him last night, so he shouldn't be hungry. Any ideas on what is going on??