No, but they do remain at home and not wander.
if they are not female and are not fixed
If they aren't neutered, yes.
No, after being spayed, fixed adult female dogs no longer go into heat because the surgery removes their reproductive organs, including the ovaries which produce hormones responsible for the heat cycle.
They still may have the urge after being fixed if the female is in heat, or goes into heat. Just because the male is fixed, doesn't mean he has lost the urge, or can't do it any more. All that has been removed is his nuts and sperm. Therefore, the male and female can still mate and get locked up, but can not get pregnant unless it is recently after the male has been fixed and he still has a little bit of sperm in his system.
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.
All Female dogs can have puppies, but only if that havn't been fixed. I don;t completely understand your question but by 'may' I think you might have meant 'many'.
Yes as long as they are not fixed Such as dogs some peopel buy dipers for dogs because they have a period tho i believe it is only once a year when they are in heat
Some female dogs get Pyometra, a disease of the uterus. It will make their organs fill with pus and they will rupture. Get her fixed. Also, your male dog is fixed, so it should be fine, if you notice a lot of humping, separate them if necessary.
You can determine if your dog is fixed by checking for a small incision scar on the abdomen. Female dogs will have a scar from spaying surgery, which is usually located near the belly button. Male dogs will have a scar from neutering surgery, which is typically located on the scrotum or abdomen.
Any, and all that are available. If you were to let a in-heat female loose with 50 intact male dogs, she would mate with every single one of them, if she had the time. Don't think a female won't breed with a great Dane if she's a JRT, or a chihuahua if she's a Labrador. Dogs do crazy things when their instincts kick in. Be careful!
it is to show dominance over the other dog.
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