Hi my female 3 year old house cat visited the vet today for her yearly booster, on returning home she was a little timid but expected after a jab. After an hour she started panting heavily and squealing every so often she was very lethargic at this point. She then managed to walk into our hall way(very wobbly) she lay down and started to cough a significant amount of blood, in a lot of pain she then died in a pool of coughed up blood and wee, no health problems previous at all and a healthy 4.4 kg. Any ideas would help ? She actually died while I was on the phone to the vet ??