
Fingers crossed things have got going by now!
I've had this happen a few times. Sadly it's not always possible to get a mating at all. Maybe it's a breed thing? The only breed I've bred,or handled dogs when mating, is my own. So know nothing about other breeds. But my opinion is that the urge to mate is one important thing to consider when choosing a dog for your bitch. If we keep using males that have to be more or less persuaded to mate, or who need to be almost forced, then we'll end up in a very difficult situation eventually. Here you're not supposed to AI unless both dogs have had litters the natural way first. But you can get a vet to verify the natural instincts are there, and get round the rule that way.
Edited to add: The above is only a general comment on difficult matings. In no way referring to the two dogs briedog is mating, about which I of course know nothing!
To perrodeagua, my breed isn't one you really want to mate indoors. So I'd think a DDB couple even less ;-) Still, when you're getting frustrated enough, you're prepared to try anything that might work ;-)