dont punish yourself about it, you saved the one that was cold,,and as you was with her for the rest of the litter, you probably helped by being there with her when she had them. its very sad to loose a puppy or kitten and we all say ,if only,,,,,,,,,,,,concentrate on the ones that are here,,,,,,,,,,,,,,,,and when you have time,we would love to see some pictures,,,,,,,

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