I'm not saying this to get a rise out of people, I genuinely don't like large dogs. You can come with the whole "if they're properly trained/raised" all you want to but that doesn't make me any less terrified of them. Loud and obnoxious. And when they invade my precious personal space I have to fight the urge not to kick 'em in the head to get them the fuck away from me. They're needy, they smell, they drag filth everywhere and their god damn drool is revolting. And have you seen a dog snarl? Shown its teeth? Yeah, real cute. Man's best friend and all. To me it just looks like a fucking beast putting on a show and at any moment that terrifying maw is gonna flex open and sink its teeth into someone.
And I have no idea 'why' I have such a fear and disgust of large dogs, at least the small ones I feel like I could easily break open like a piñata if they get violent, but large ones? I dunno. Maybe I have a repressed memory from my childhood or something cause I can't see any reason for why I have this fear of them.
Meanwhile, I'm a sucker for cats, who claw the shit out of their owners. So maybe I'm just deluded.
[edit]
I suppose it could be a combination of things. Such as my hypochondria and germophobia. Like I said, dogs smell, and that scent does not smell 'clean' to me. Dogs also drool and I'm not keen on the idea of another species' bodily fluids touching me of infecting my stuff. I also don't like large things I can't control. Which is why I am terrified to ride on a scooter or motorcycle or drive a car. And because of my sensitive hearing any loud noise causes me to have split-second panic. Then we have the personal space issue, I'm an introvert and I am uncomfortable with being touched by others when I don't feel like it. I also can't stand someone who's needy being dependent on me as that means I have to break away from what I want to do just to appease them (which is a large reason for why I don't want to have kids).
With cats... Well, they ain't loud. They ain't drooling. They ain't needy. They understand personal space. And they're small enough that if they snapped I could easily bodyslam them.