Going on looks alone, which is no way to pick out a dog, I'd have to say
Dalmatians
American Pit Bull Terriers
Great Danes
Ibizan Hounds
Bouvier des Flandres
Old English Sheepdogs
Standard Poodles in continental clip
Irish Wolfhounds
Catahoula Leopard Dogs
Pug/Beagle mixes
Dobermans
Malinois
Chihuahua

and dogs that I don't particularly find attractive,
Bichon Frise
most long haired dogs under 15 pounds

that is just my own opinion.