If you are refering to picking up a dog by their skin on the back of the neck like a cat then yes. you can. only when its a puppy though. It is how its mother carried them around. when they are 3 months old you should no longer pick them up like that,if ever because it mess with their nerves around their head and may even cause paralyzation or brain damage.
The fly would not feel anything.
They do it when they feel threatened, or when they're about to snap at you.
Because they feel like they are bigger, they are the dominant one. Dogs like to be noticed as the alpha male so they will try to do anything to dominate them.
You do not have to do anything and should not feel you have to do anything. Just be friends with them.
Yes dogs can sense how you feel whether you are scared or happy :)
As nobody has come back from heaven, so we can not tell anything.
Car food can be anything that you feel comfortable eating in a car. i.e. hot dogs, hamburgers, etc. It's really up to you.
Yes, most dogs generally do.
If you don't love him or her you don't feel anything.
Yes
bad
If you are sleeping all day and feel like throwing up anything you eat, you may have an immune disease and you should talk to your doctor about it.