It's getting old. Give it vitamins.
All dogs have hair, but if you mean LONG hair, only if the chihuahua was the long haired breed.
If you mean the dog, it is chihuahua.
If a dog (any dog) is losing hair in big enough patches to see his bare skin where he has lost it, he probably has mange, and should be seen by a vet. There are other causes too,but mange is the first thing the vet will suspect. Take him to the vet.
Only if you have chemotherapy wil lyou loose your hair
Shedding is another word for losing hair.
Only if it keeps getting higher.
define 'losing hair'. if it comes our while brushing etc, that's one thing. but if it comes out in handfuls that's another.
You may have alopecia areata
You're hair starts to turn gray as you grow older.
Well to mean it means that their nervous about something.
Not always, some people get hairy legs before they develop pubic hair. Pubic hair starts to grow during puberty.
Do you mean chihuahua as in the dog