You have to do what is good for the dog, and not for you. Dogs and cats aren't material possessions, cash machines or fashion accessories. They are intelligent, living creatures who deserve more than an existence of manufacturing.
I suggest you calm down, and do some thinking. Why exactly do you want to breed those dogs?
Do you want to observe the pregnancy and birth out of curiosity? Do you think the dog actually knows about bearing young and desires it? Do you want to have extra dogs in your household and not have to purchase or adopt more? Are you wanting to sell them, thinking you can make some cash?
I agree with the others..way too many unwanted animals on this planet right now and millions are dying.
If people didn't give you the answers you wanted to hear, then share what advice you hoped to receive instead.