
Alison, I think you will get different answers depending on breed and experience. With mine, I would be at the veterinary hospital sooner rather than later - and I most definitely never panic. Although I have whelped loads of toy litters, once water breaks, I refuse to wait over 40 minutes before getting in the car.
To be fair, once a bitch starts, I have everything ready "just in case" as it is no big deal to not need it, but a bloody big deal if it's not ready and needed desperately!
So far, I have never, ever regretted a decision to make a nighttime drive down the motorway. The last time I needed a vet, the bitch had whelped previously, so I had an idea of what to expect, and I felt that she wasn't progressing as fast as I would expect. I raced to the hospital, where the vet agreed that the bitch was fully dilated.
She gave my girl oxytocin, and asked if I wanted to go home. I appreciate that lots of breeders take the bitch home, and that's fine. But it is something that I won't do with the tiny breeds. I once drove back with a bitch, and, being alone, I could do nothing about helping my girl when she started producing. I was on a motorway, and she had to manage while we got home. A dead puppy was the result.
So, I stayed with my girl, and the vet went off to make us a coffee. I hadn't met this vet before, so we got to know each other while my girl had been placed in a heated cabinet. I was there for over 4 hours, and was allowed to deliver my own litter.
But, had my girl needed surgery, we could have got the section underway pretty darn quick. My invoice said "supervised whelping." It was worth a couple of hundred quid to know that my bitch wasn't going to be in danger because I couldn't get to the hospital in time.