this problem can be sorted, when i got my scampi i took some food away from him and he bit me so i bit him back on the neck while holding him on his back, he was about 4 months at the time and in the 15 years of his life he NEVER bit me, growled at me, walked through a door b4 me, or kept eye contact for very long with me, he knew i was top dog well ether that or he thought i was mad lol
annie was given to me cos she bit a little boy on the face twice, the lady told me that annie had always been like this and she was now 5 years old and no matter what they did she did what she wanted, in half an hour of having annie she bit all 3 of my yorkies and the cat, i told her NO and stode over her and did the same over the next few weeks when she bit them, i also gave her her food and then took it away and pretended to eat it as the pack leader eats first, the first few times she wasnt happy about this but with time she stopped biting the others never growled, let me take her food out of her mouth, and she loved my 5 year old niece to bits. problem sorted
if hes marking get him done, get a pet spray that smells nasty to dogs and spray that the places he has marked, do the thing with the food someone else told you about, stand at a door and make him wait till you walk through it, look him in the eye and dont loose eye contact till he looks away and if he growls or bites you or doesnt do what you want him to do put him on his back.
if hes getting in the trash put it somewhere he cant get it or set him up by putting something in it that tastes really sour so he gets a bad experence with doing it or when you find him in the trash make a sound with something that he wont like.
good luck