Answer:
When you buy me I am costly, but the only use I have is hanging only. What am I?
At night I come without being fetched, and by day I am lost without being stolen. What am I?
What runs around the whole yard without moving?
You buy me to eat, but never eat me. What am I?
I will disappear every time you say my name.
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk