Answer:
I'm the source of all emotion but I'm caged in a white prison.
I am the kind of dog that chases anything red.
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.
First I may be your servant's name; then your desires I may proclaim; And when your mortal life is over hold all your wealth within my power.
Of these things - I have two. One for me - and one for you. And when you ask about the price I simply smile and nod twice.
you hold my tail while I fish for you
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic