Yes. It is just like how after the first sex, a human can get pregnant.
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."
He will try to mate with her, stand up on her back & hump her. If she is not fixed she will get pregnant.
By mating with a male dog.
Yes.
Male dogs may still attempt to mount a pregnant female dog due to instinctual behavior, but if the female is far along in her pregnancy, she may not be receptive to mating. It's best to supervise and separate the dogs if necessary to prevent any stress or potential harm.
A male dog may hump its female owner as a display of dominance, excitement, or as a way to release pent-up energy or stress. It is important to address this behavior through training and proper exercise to prevent it from becoming a habit.
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.
Like breed her? Female will usually only allow a male on her when she is in heat.
no but its highly likely
Yes. Only the testicles on the male have been removed, not the penis. Penetration will still happen, as the male dog can still maintain an erection. There is just no sperm production. Indeed, neutered male dogs can maintain an erection, penetrate a female and actually achieve orgasm, and will "tie" with the female. Most neutered males are less interested in sex due to lowered testosterone levels, but still capable of all the actions. They simply do not produce sperm and cannot impregnate a female.
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.
Yes. You can get pregnant no matter how old either one is.