Chloe hates baby gates, but that is because as a pup she had quite a few fall on her (due to her jumping on them). Other than that, she doesn't really have any weird fears, surprisingly. Well, she hates gunshots, fireworks, and thunder...but those are normal. Oh, she doesn't like the basement stairs. They're wooden steps that aren't carpeted (unfinished) and she HATES them. Every time we walk downstairs she stands at the doorway and looks at us with this horribly worried face.
As far as I've been able to tell, Cynder fears absolutely nothing.
But Sadie, the Lab pup we raised, had some weird ones. LOL Balloons being blown up completely freaked her out, she hated the smell of gas (from the stove) and consequently, the sound of the stove being lit (or a lighter). She also didn't like noise makers being blown (not the noisy ones...but the ones that you just blow air into and they shoot out a thing). She also hated barn fans. She was a completely stable dog and could tolerate anything in public with aplomb, but we always joked that she should never be invited to a birthday party. LOL