Good Riddles

Question: I'm fat and I'm round and I cause much joy, I'm often a dogs favorite toy. What am I?

Question: If you have me, you want to share me. If you share me, you haven't got me. What am I?

Question: An iron horse with a tail of flax. The more the horse gallops, the longer his tail becomes.

Question: It breaks away from its pack. It creates holes in its victims. It can travel for miles and then disappear. It is part of a dying breed. What is it?

Question: I come in many different colors. I create boundaries to keep things concealed and safe. My best friend is a lock and I am also made of different materials as well. I love to travel: you can find me anywhere. What am I?