Answer:
Crooked as a rainbow and slick as a plate ten thousand horses can't pull me straight.
I am an activity dogs are very good at when a ball is thrown.
What has a ring but no finger?
I am a sharp looking horse with a flaxen tail. The longer I run the shorter my tail becomes.
I am the place to turn when nature calls.
I flow from the Homerβs mouth when he sees doughnuts.