Answer:
I can swim but never get wet. I can run but never get tired. I follow you everywhere but never say a word.
I am needed for most animals and hardcover books
What has one head one foot and four legs?
I am a sharp looking horse with a flaxen tail. The longer I run the shorter my tail becomes.
I'm tall when I'm young and short when I'm old. What am I?
Give it food and it will live, give it water and it will die.