Nothing, just have the son or the mother neutered...animals do not understand about this
yes.
NO WAY!! That is called inbreeding.
she might not rember him or that hes her son it should be ok as long as you keep a eye on him
yes you can even breed daughter to father but not mother to son
The big dog is the mother of the little dog.
Any dog can mate with another breed of dog.
Never.It is because the offspring will have hereditary diseases.
They can have all kinds of problems as well as deformity. Brothers and sisters should never breed. You can breed a father to a daughter and a mother to a son but not sister to brother. It is also bad to down breed to the second generation. You end up with smaller and sickly babies then.
Please give more detail to your question. What do you mean by when a dog fights over mate. However a dog will fight over another dog until one dog is hurt or the mate chooses.
Only if the larger dog is the female. If the female is smaller, then the puppies will be larger that what she is naturally able to birth, and the unborn puppies may get stuck in the birth canal. This can potentially kill both mother and pups if there is no immediate emergency care.
A bulldog is a dog and can mate a dog to produce offspring .
No. Only dogs can mate with dogs.