Are there any species of pets that terrify you?

I wasn't sure how to answer this because there's "wouldn't touch" and that's different from being terrified. Like I'd never touch a rat, or probably a spider, but they don't actually terrify me. Now I do get a little shaky around a few big dog breeds ever since I was attacked by one when I was about 8 but it's a subconscious thing and I get over it quickly when I'm around them.