many pet stores sell de-fleeing ointments, that is really all you can do. sorry it's not much help
yes gerbil should aways have wheels with them
Depends about the dog and gerbil. You should bring your gerbil to a vet (if they do gerbils).
It is possible. a hamster should not be kept with a gerbil. The hamster may also try kill the gerbil if it dislikes it.
no questions asked take your gerbil to the vets straight away
WHY is there wax on your gerbil? If hot wax fell on your gerbil its probably burned. You should take it to a vet.
if your gerbil chews its cage bars, then eventually it will wear away the hair on the top of its nose. if its in a pair maybe the other one has hurt it or it might have fleas/mights.
No
Average adult gerbil weighs about 2.5 oz
you don't need to if you have another gerbil because they clean each other :)
Yes, it is possible and likely that the cat would try to catch, kill and maybe eat the gerbil. You should keep the gerbil in a cage that isn't accessible by the cat.
YES! it would be creepy not to; just having a dead gerbil sitting there. YUK!
you should check your dogs fur it MIGHT have fleas