Nothing will happen. She won't get pregnant, since he lacks the tools to impregnate her.
he should get fixed
No
Get her fixed!
no. if a dog is fixed they can never become unfixed.
Uh.....huh??
Yes. It definitely happened to my dog.
they could but they wouldnt do it
the male dog acts funny because they know they can not "make anything" with the female dog.
The female should be spayed (fixed) at about 6 months. Some believe that she should have a litter before being spayed, but the only thing that does is add more unwanted dogs to the dog pound.
Yes as long as the male dog is not fixed
If your male dog is not already neutered, neuter him.
Even if a female dog is fixed, if she is on her period, there won't be blood, but she will still give off the nasty smell and that could possibly attract the males, yes. Sometimes though, a male dog (or MAYBE, female) just gets overexcited and, well, you know the rest :D