Answer:
What grows up while growing down?
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 always goes to bed with its shoes on?
These animals hang out in the mist.
It can be white or blue or black, Humped or have a horn. And when it talks it sings its menuets, as it's travelling the depths.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?