If this is the case with your dog you should seek immediate medical attention. If anyone else has witnessed your dog's collapse/s then take them with you to the veterinarian as they may be able to also give some clues to the vet that will help in the diagnosis and treatment of your dog.
There are several different signs and symptoms that are indicative of a stillbirth in the third trimester. The common symptoms of miscarriage in the third trimester are more or less the same as the first or second trimester. However, the severity of the symptoms could be a lot worse. Given below, as some of the most common signs of miscarriage in third trimester: 1  Heavy vaginal bleeding. 2  Spotting or colored discharge from the vagina. 3  Severe cramps and pain in the abdominal region. 4  Pain in the lower back. 5  Nausea, vomiting and diarrhea. 6  Pain in the shoulder. 7  Tightness and bloating feeling the stomach.
In about half of all cases, the cause of stillbirth is unknown. 1  Birth defects, with or without a chromosomal abnormality.  Problems with the umbilical cord. With a prolapsed umbilical cord, the cord comes out of the vagina before the baby, blocking the oxygen supply before the baby can breathe on its own.