No that's a good sign because they naturally have dry poop because in the wild they need to conserve as much water as possible.
Yes.
yes
Gerbil poo is so dry due to the gerbil's incredibly efficient water-conserving excretory system, that it practically has no smell.
Only if you hold by the very tip. Other wise, your gerbil won't be hurt by you holding it by its tail.
yes
Yes it is!
Cancer
Yes.
No but when it is red it's bad
pooping is a blessing from the lord, you can never poop to much
Their buttocks may be stretch making the gerbil too poop down while held by their tails.
Yes, but just a damp one. And make sure your gerbil is comfortable with it. He/She must be completely dry before being put back in his/her cage.