We had a litter of 4 around a week ago but only 1 made it. The other 3 were still born. With this last puppy, the mother gave it lots of attention but it died earlier today from heart problems. Now all the mom does is go to the area where the puppy would be. We pull her away from the area and give her attention but she doesn't have the energy she used to. She's eating fine but instead of being unusually energetic (she was more hyper than the average 6 month old puppy), she doesnt walk around too much. We have her in the house and giving her lots of attention. Besides get another dog for her (we already have two more), what else can we do? She does not have any remaining puppies or placentas inside her (confirmed by vet).