[yorkietalkjilly]

He's just a tiny baby who has little ability to hold his urine/poop and cries often because he yearns as an infant to be near and sleep with his pack/his mommy for security and nurture as canines instinctively do. It's perfectly normal for a dog to want to sleep touching or very near a pack mate. I'd move his bed or crate to a chair and set it right beside my bed or put him in a hardshell airline carrier that goes in your bed so he will be able to sleep near you - his only pack member now. He won't cry trying to call his pack to him if he's with you as is normal for a dog.

I've heard from many breeders that changing a very young puppy's food is not a good idea until he's a bit older as the changeover can upset their GI system, give them diarrhea or cause vomiting and fluid loss. And when you do make the change, gradually add only a bit of the new food to his old food a little at a time so as not to upset his GI system.

He's biting because young dogs bite and nip at everything and are usually teething and biting eases their gums. A frozen wash cloth may be soothing to offer him to chew on or offer him squeaky toys or appropriate things to chew on when he bites you. Once he's a bit older, when he bites hard you can say "No bite!" and gently hold his tiny muzzle for a couple of seconds, until he's unhappy. He won't like that but he will soon learn not to bite like that so as to avoid his muzzle being held onto. Others say squealing or screaming out stops their dogs from biting hard but it only excites mine and they want to bite more out of excitement! lol.

In order to housebreak him, you'll need put him on a confinement schedule to in a crate to keep him in when you can't be watching him in order to encourage him to hold his urine and poop and keep him from soiling your floor. Use one of the good housebreaking schedules that gives you specific times for feeding, pooping, playing/exercising, cuddling and back in confinement until the next free period out of the crate. Our YT Library here has some good Housebreaking schedules and tips.