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Hi there, vet Andrew here. Is this Masie's first litter?
Is she still straining?
OK. I'm sorry to hear about the first dead up, but often the first and last ones don't make it. 2 hours is a little long to wait between pups, and the panting and shivering suggest to me she might have a condition called ECLAMPSIA, which is a deficiency of calcium. This will stop her from being able to push the pups out properly. Left untreated, it can be dangerous. I suggest you call an emergency vet to check her over. They will be able to give her an injection of calcium - this may help her give birth properly. If not, she may need a C-section.
If you have any more questions, please don't hesitate to ask.
Good. I wish you both all the best. Andrew.