A friend of mine lost six of nine of his cattle in one of his pastures in a period of six days. They all weighed around 800 lbs. All the cattle had symptoms of troubled breathing and foaming at the mouth when near death. Seemed like they had trouble swallowing. They became weak and could not get up. Most of the cattle died within 12 hours from the first signs of a sickness. A few days ago he fed the calves and they all looked healthy and were all eating. He came home six hours later and one calf was dead and another died two hours later. The vet came at midnight one night and said a few may have pneumonia but blood tests were needed. He gave vaccinations and several antibiotics immediately but did not help. Two of them died after the antibiotics. The vet ruled out the possibility of rabies. Could it be anthrax? Any ideas on what would cause them to die so quick?