Answer:
I am heavy forward, but backward I'm not. What am I?
Canine children.
I go from house to house a messenger small and tight. Whether it rains or snows I sleep outside at night.
As a state in the USA, I am round on both sides and high in the middle. What am I?
I am a shimmering field that reaches far. Yet I have no tracks and am crossed without paths.
I have a ring but no fingers. I used to stay still all the time but nowadays I follow you around.