Answer:
My tail is long my coat is brown I like the country I like the town. I can live in a house or live in a shed And I come out to play when you are in bed.
I hold two people together but touch only one.
Everyone has me except for a few. You may not be able to identify me but I can always identify you. What am I?
I stand in one place yet I fill a whole room. I can be filled with molten rock and come in every hue.
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
I am owned by Old McDonald.