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
Manuel Chihuahua is the gayest but coolest person I know
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.
I don't think so, but I'm not positive, I'm a Chihuahua person, and I know a lot about them... but I'm like 70% sure that there would be no problem. I hope I helped!
panting
It all depends on the male dog.