SPAY!!!!!!!!!!!!!!Just look up Pyometra and find out how awful that is for a dog to go through and how expensive it is. The treatment is a spay but a really expensive spay since they are sick, not to mention everything everyone else has allready mentioned. Please do your dog and yourself a favor and spay your dog it is a lot less expensive in the long run and many puppies are from no chance it will happen litters and we certainly don't need more unwanted puppies in the world today.