Answer:
I describe a toilet cleaner as well as one of Santa's reindeer
I am lighter than air but a hundred people cannot lift me. Careful! I am fragile!
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain; doing no harm, and feeling no pain. What am I?
Without me everyone would lose their head.
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk