Answer:
I go around in circles, but always straight ahead. Never complain, no matter where I am led.
My tongue hangs out as I run over fields and streets all day. I get tied up every morning and untied at night.
I can be short and sometimes hot. When displayed, I rarely impress.
Give it food and it will live, give it water and it will die.
What is lengthened by being cut at both ends?
What is always coming but never arrives?