Answer:
You will find me with four legs, but no hair. People ride me for hours, but I don't go anywhere without needing to be tugged. Jerked or turned on, I always manage to be ready for work.
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
It doesn't live within a house, nor does it live without. Most will use it when they come in, and again when they go out.
What goes with a car, comes with a car, is no use to a car but a car cannot move without it?
Soldiers line up spaced with pride. Two long rows lined side by side. One sole unit can decide, if the rows will unite or divide.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.