Our dog Haven, a 10 year old Australian Shepherd, was diagnosed a month ago with Osteosarcoma after a limp developed. She had he right front leg amputated 6/13/23. She had no visible lung mets, no issues, clean blood work, respiratory rate of about 30. Vet said during surgery blood oxygen was low and extubation produced some blood. Nine days ago she was wet hacking in the night, and with a massage to her diaphragm and throat produced what I can describe as a bloody clam. No other symptoms, no heavy breathing, still our normal happy dog. Today, the cough came again. I massaged her diaphragm and instantly she produced another clam. I photographed both, but this one I cleaned to better see. Any ideas would be so appreciated. Our vet, once we told him we were going the holistic route- supplements etc., told us to "Let him know when the stuff hits the fan." It made me not want to reach out to him. Haven is so so happy, I just don't understand what this could be, I've done so much research with no solutions.