
I have deliberately started a new thread on this subject because while I don't want to upset the breeder who had a bad experience with her recent litter, I also don't want others who may not be as experienced as some, to wait, and lose puppies. I speak from a terrible time I had with my UK Champion bitch, as already posted, when after A VET waited, we lost 5 of the 9 puppies in that litter. The 5th being too weak to survive. I learnt afterwards that this vet (who wasn't my usual one at that practice who was away) no longer did surgery. At no point was I warned about that!
As always with mine, who did go into secondary inertia more often than not, I didn't let them go over by more than 2 days from the first mating, without involving my vet at the time. I'd take them in to be examined, and usually x-rayed to see the status of the puppies and then, depending on how we both felt, and the condition of mum (cervex), move to either a shot of oxytocin to see if that got things moving, or go straight for a C.Section. Further, if there was any sign of prolongued strong contractions, for more than 1 hour without seeing a puppy born (every delivery), then for sure, I'd be off to the vet.
As for delivery en route - I always advised taking a box with a heat pad in it, and whelping equipment, in case things progressed during the journey to the vet - and btw, taking the bitch for a car ride was a well known 'trick' amongst older breeders, to get things moving.
Message - despite what others have experienced, every delivery (even from the same bitch) is an individual event so to wait isn't necessarily the advice I'd give, in general - which is why it helps to have an experienced mentor within the breed, on hand.