SHe's been having contractions since around 2pm, and pushing for a few minutes about every five minutes. I called the vet (it's been about 2 hours and no puppies/sack) and they told me to give her another hour or two. I'm still worried though. ??? The puppies look as though they're in the same position and I don't see much of a change in her. Poor thing, I feel terrible for her.

How long should I wait before taking action? Should I take the vet's advice and give it another 2 hours?
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Tara & Arthur
Chloe, Maya, Mallory, & Marina