There is probably something wrong with it. Take your dog to your vet.
It will make the itch a lot worse.
usually
Chihuahua pups do of course
WHAT DO YOU MEAN?
sometimes they can but most likely no
u have chicken pox
As long as they aren't carrying malaria the only bad thing is that it will itch. If you itch them they will leave scars.
Chicken poxs if they are red
My chihuahua loves being in a purse. It makes it a lot easier when I take her to busier areas. But really its up to your chihuahua. If she's not comfortable, then it's much better off on a leash.
If its calm you can clean it in the bathtub or if it moves lot you can clean it with a hose.
You cant unless you want to itch a lot!