Just like people or more so, pets usually try to fit into the crowd, dogs especially. Copying the good along with the not so much sometimes. Rewards can help when doing they're doing well to slow the undesirable traits. Love and time can help the anxiety issues as well as some other distractions can they may enjoy too. - Like treats, toys or biscuits and activities. Puppy treats can still work well on full grown dogs too, some larger dogs enjoy them as much or better than the larger treats. And, it's still a treat for them, so there's the reinforcement?
Dogs usually look for and expect commitment from humans because they give it almost unconditionally, if it's finally broke? It needs more reinforcement to reinstill. More activities like going for walks can usually reinforce that. So can the wrestling around with them. They're almost usually perpetual two year olds and love frequent attention and activity.
