Spay her! You rescued her so why would it be fair to put her through pregnancy? Rescues don't adopt dogs out for them to be breeding machines. There are already so many dogs in shelters, why bring more into this world.
Also, if you spay... you reduce her chances of cancer significantly and you don't have to deal with her going into heat. Full sized dogs will jump fences to get to a female in heat and that is not something worth risking. |