Dog breeding tips

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I have 2 dogs, a labrador and a staff. Neither of them have been done as I want them to mate first and then I'll get them done. But does anyone have any tips especially about when a dog is pregnant so that I'm not completely in the dark when it happens. I know it's best to leave the mother to it wehn the babies start being born but I would still like to know of anything I can do and what I should have to hand just in case.