I have heard peoplewith the blue chi's often have problems. What color is your little girl? you should probable take her to the vet, I think there can be several reasons for hair loss. Including diet?
Not much help maybe someone with more knowledge will jump on here and give you some advice.
Glyn has a bald head and tail and fairly bald on his body, hes 8 months, and blue & tan, just the blue is bald, unfortunatly theres nothing that can be done if its colour dilute,
is yours blue, any pics
One is fawn, one is black tan. They are 1/2 of their normal expected body weight, probably severe malnutrition. Already vetted them and had skin scraping which was negative. Just wondering if any knew of a vitamen or something that could help them
Just on their head? Like around their eyes/ears? It is probably Chihuahua Pattern Baldness...not a whole lot can be done for it, you can give The Missing Link, my chihuahua Zoey grew back some hair on her neck/chest area on that supplement. I also use Melatonin for alopecia 1mg per 11#.