When she is in heat. Look for signs such as..
Vaginal discharge which is clear
Bleeding and swelling of the vulva
Increased restlessness
Yes, as long as the chihuahua is "in heat" and they get "hung" (which you will know), the pug can get the chihuahua pregnant.
No.
I don't see how it concerns the chihuahua
there belly and pups.
63 days
They have a 90 day gestation period.
It's life, when a male mates with a female the female gets pregnant. Remember unless you don't want an unspayed female to get pregnant, keep her away from the male! taking care of an pregnant chihuahua is very hard... And expensive.
Its not hard at all. When in heat they should be able to get pregnant. Sometimes on their first time they don't get pregnant. But that's rare.
It all depends on the male dog.
My 6 year old chihuahua is pregnant by a 6 month old chihuahua. The vet said that the pups may not survive after birth.
yes. it is always good to give your pregnant dog support.
Yes. Please spay her if you're going to keep her in the same house as him.