Digging, panting, temperature drop, dilated eyes, staring, frequent urination or bowel movements, lying down and stretching out, howling, nesting, trying to go to a dark warm area.

I'm assuming since this was posted in the dog breeding section that you are talking about dog pregnancy. That lasts 9 weeks. Or 63 days from OVULATION not from breeding.

She has fading puppy syndrome. Keep her warm!! Heat pads and heat labs and warm formula! Also take her to the vet for sub-Q hydrating. Best of luck

TAKE HER TO THE VET NOW. The greenish black mean detaching placentas which means dead pups. Go to the vet for a section now! Please

Hello. I am a dog breeder my self. Yes your dog is most likely in stage 1 of labour. Call your vet and tell him/her what is going on. The puppies will be out in 2-24 hours. Best of luck!