Spaying of the Female dog

Spaying of the female dog is undertaken to control the unwanted pregnancy by crossing of some unknown or country or non-descript dogs.
The spaying of the dog reduces the aggressiveness of the dog.

By spaying, one can reduce the incidences of the commonly encountered reproductive diseases like pyometra.
Spaying also helps to control the population in case of stray animals and many nations are doing these operations by removing the ovaries from the female animals.
 Experienced veterinarians are required to do the spaying in case of female dogs and the postoperative care is to be given more emphasis.
 If proper control measures are not taken after the surgical operation for the removal of ovary, then the infections may start setting in and the animal may end up in development of peritonitis and then toxemia sets in, causing unwanted health problems.
Death of the dog may finally occur, if the dog is not provided an effective and proper veterinary care. 
A female dog that is spayed before the occurrence of first heat will have almost a zero chance of development of mammary cancer, which is more common with the dogs that are not spayed. A female dog generally comes to heat once in eight months or so.
During the heat occurrence, there is bleeding from vagina and the dog may cross with the unwanted male and the spaying activity prevents all these.
 In case of aged dogs, the dog may often get signs of increased thirst, anorexia, vomiting etc.
that are so common with pyometra.
Pyometra means the presence of pus in the uterus.
Once pyometra occurs, it involves many discomforts to the animal in addition to the cost factor involved for the therapy also.
Such pyometra is totally prevented by spaying because in the case of spaying, you are removing both ovaries and the uterus.