My mom's nearly 9-year-old mini dachsund died over the weekend. He had a heart murmur and was overweight, but he had not been ill. Mom said he was panting the night before. He would usually pant when he was hot until he heard the Ac come on, then he'd stop, but he didn't that night. I didn't have an autopsy because mom blames herself. But she found him in the morning, dead. His eyes were open and it looked like the blood vessels had burst in both eyes and he was bleeding from them. What could have cuased his death? I guess I'm wondering if he suffered.