Yesterday I took my cat to the vet to vaccinate him. After that, he was dozy and sleepy all day, but ate fine, even played a little.. In the evening he lay down suddenly and couldn't catch his breath, like he was wheezing, and blood started coming out of his mouth. Soon there was more and more blood oozing out, also from his ears, and my beloved kitten died. I can't see any reason for that to happen other than vaccination - before that, he was in a perfect condition and there was nothing unusual on that day; he couldn't poison himself, as he is kept indoors and also because it was a Saturday and a day off work for us, we cuddled him all day long and kept a watchful eye over him. It was a standard 9 weeks vaccination - does anyone have any similar experiences with a cat feeling unwell after vaccination?