She could die.
A female pug with a hernia SHOULD NOT BE BRED even if repaired. A male dog with a hernia may be bred. You can have the hernia repaired surgically.
NO
If the female is trying to get pregnant with a male dog then it will go on the males back but if the female dog is going on the males back while pregnant then it may means that they wanted to have another baby.
By mating with a male dog.
No
Sometimes.
doggy style. How did you think they do it?
Yes.
I would definitely have the hernia repaired before you breed your dog. I work in an animal hospital, we had a pregnant dog come in with a puppy stuck in a hernia. It wasn't good, she and puppies died from infection because pup in hernia had died a while before the owners knew their was a problem.
Often, a male dog is protective of the pregnant female dog, usually if he is the "mate." Sometimes dogs, mates of the pregnant dog or not, will act aggressivley towards the female dog, also known as the "bitch."
No
If the male has not been neutered and/or the female has not been spayed, then yes. And unneutered dog can get any unspayed female dog pregnant.