Answer:
I tell people to be careful when handling boxes.
I am a sharp looking horse with a flaxen tail. The longer I run the shorter my tail becomes.
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.
I have three feet but I cannot walk. What am I?
I have hands but cannot clap. What am I?
It is something you make after you've weighed your options.