Ok, so lots of these are unflattering but it's just what we see a lot of in my particular area and what's coming to me off the top of my head. For whatever it's worth I still like the good examples of a lot of these breeds...
GSDs: Neurotic, unstable, strangely soft and sensitive. Incapable of play with dogs, even as youngsters, and what looks like play winds up turning into guarding (a person, a space) or herding/non-mutual chasing.
Border Collies: Soft as warm butter with people (yelling "hey!" actually does affect them), strange with everything else - from lights moving to other dogs.
Papillons: Looooooooud. Shrieks to rival a cattle dog's or a Shiba's.
Boxers: Barrier issues, reactive, often bad with other dogs (too pushy in the play, don't take corrections well especially from dogs of the same sex, will redirect onto other dogs if the barrier frustration grows too much)
Standard Poodles: Vertical in all senses of the word. And do a hard nose jab at dogs they want to play with - repeatedly. No matter how much the other dog doesn't want to play or how many "please leave me alone" signals it gives.
Shar Pei and Chows: Watching you like the velociraptor in Jurassic Park does. If they like you, they love you - if they don't like you, don't even bother trying
Chihuahuas: Bite first, ask questions later. Pull scary faces frequently
Aussies: No sense of personal space, will bulldoze into you and not understand why not everyone finds that endearing
Goldens: Either the life of the party OR the stressed-out fun police who don't understand why there's so much noise and chaos and oh god make it stop
Belgians and ACDs: Did you want me to herd that dog to you? Here, let me herd him over. That'll teach him to have fun when I'm around!
Dobermans: Separation anxiety for days
Spaniels of all stripes: Big babies but will quietly accept what they consider to be their horrible fate (getting groomed, what have you) with incredibly heartbreaking faces and a lot of lip licking
Pits: overarousal problems out the wazoo. No impulse control, like to play with other dogs but the play frequently tips into something less pleasant for the other dog
