Jeez, and people said my 25 pound cat was big! He was, and at the Vet's office, totally out of control. He was, until recently, "the worst" patient the vet had in 35 years of practice. We had to put him to sleep about 5 years ago at about 17 years old.
He had a major operation, and I was told he was going to have to stay at the Vet for 2 or 3 days. I took him in at 8am, and at 11, the vet tells me to come get him, "He would be much happier at home, you need to come get him, now!" He was so wound up he bit me several times and messed himself, so I had to wash him down before I took him, and that made him even angrier, and he was still upset the next morning, shreiking anytime we came near him and staying under the bed all day, and growling when his name was spoken.
The new "worst ever" is almost as big as mine was, and is even nastier and louder than mine was.