We may have more quirks than I realize because our dogs are a bit odd, but the main quirky dog is Aeri.
Aeri has an elaborate potty routine that I still haven't figured out exactly, though I know that if I corner her in a part of the yard she'll potty faster as it seems to involve a certain number of pacing loops. And, this is gross, but often if she has to poop she'll try to find some to eat right beforehand.
Another one: She rarely snuggles, but she has a "rug of solitude" in the kitchen that she will hang out on so she can keep an eye on me in the living room. She has a similar spot in the kitchen when we're eating dinner. If you acknowledge her on her rug or in her spot, she'll move, like she's annoyed that she's been caught.
Kes wants to live in your skin with you, so he's usually touching part of a person, but he only does it when you are sitting on the couch or in bed, nowhere else. Not exactly a true quirk, and I kind of like it.
Snipe will watch TV at times, but she seems to know it's TV and not real since she never goes to try and find what she saw or heard on the screen, just watches it intently, sometimes for long periods. She especially liked watching Yes in concert with my husband.
Z really doesn't have quirks that I can think of.