The smell was a shock at first, but now I'm used to it and actually quite like it 
The neediness, again, a bit of a shock, but you get used to it
He's never chewed anything he shouldn't, apart from a couple of cushions when he was a puppy.
There was one time he ran through the brambles and cut his ears open. After walking him home covered in blood (he has a white coat), I plopped him in the bath and washed the blood off, then let him go downstairs to dry off. It was the first time that I'd bathed him, and forgotten that dogs rub themselves all over everything afterwards.
By the time I got downstairs, it looked like a scene from American Psycho, complete with blood sprayed up the walls where he'd rolled about and opened up the cuts on his ears and had a good old shake.
I also didn't realise what prolific killers dogs can be, he often gets hold of pigeons, rats and even a squirrel once
. I have managed to curb this by giving him a small squeaky toy to carry, which also helps with his (shit) recall.
Mostly he's a joy though, even his kitty brothers like him. Unfortunately he does harass cats that he doesn't know (wouldn't hurt one though).