Answer:
Stealthy as a shadow in the dead of night, cunning but affectionate if given a bite. Never owned but often loved. At my sport considered cruel, but that's because you never know me at all.
What has to be broken before it can be used?
I can travel from there to here by disappearing, and here to there by reappearing.
Lighter than what I am made of, More of me is hidden Than is seen.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
What is so fragile that saying its name breaks it?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?