I disagree that 4 hours is too long between pups. My Rosie had puppies 2 weeks ago, it was her first litter and she took a lot of time between a few puppies, the maximum time between pups with her whelp was about 5 hours. (then 2 came out with only a minute between them) I think as long as she is not pushing or in hard labor for that long, they should be o.k., that was the case for us, she had 5 healthy puppies. Still go with your gut, when my girl was taking 5 hours, i did have her ready to go to emergency vet at 4 in the morning, car was heated up, and I put her in her 'box ' to go with the pups we already had and was walking out the door, she began to push and within 2 minutes there was a sack, she whelped the last 2 at home. (all 5 at home,really) I would take her if she was activily pushing with no results, but if she is content I would say to wait a bit more, or until your scared about it. I realize that this has been several hours since your last post, so NOW it would be too long, but that is my advise. Update us when you can.