What a catastrophe! I'll show myself out.

He probably shouldn't have ownership over animals. Most likely.

Don't take it personally. You didn't do anything wrong.

I went once brought in my cat after it l had been hit by a car a few days prior. The "vet" was so shitty, he couldn't even bring it back to life! He just kept trying to move towards the door and asking how I managed to get past reception with a dead cat. Pfff!

I read your FML and wondered initially how you work as a vegetarian and what cats have to do with that. Then I realised I needed to get some rest.

You should've told him he sucks at his job as a pet owner. Then tell him he can go elsewhere if he wants to be a jackass.

I worked as an assistant for a vet who had a similar problem with a vegan who said he sucked at his job because he couldn't heal her cat. She gave it vegan food and refused to give him meat. She said it obviously wasn't the problem and he was a bad vet. Some people are idiots and will always think vets and doctors are supposed to perform miracles and should be able to make anything okay. I hope you don't get that type of problem too often.

Was the cat ill from eating 15 out of 16 stitching pins?

I was once working on a client's PC. He kept asking if I knew what I was doing and questioning everything I did. All because he read one thing on the internet. Fed up, I got up and said to him "here, if you know what you're doing, you fix it." That shut him up. tldr; Don't take it personally. The client is never a good judge of your job performance.

I know that you are probably right OP. But, sometimes it's best to keep it to yourself. Hope the cat survived.