Omg, couldn’t resist that if I tried. 
We had a lab who shed (and stunk) like there was no tomorrow. Our beagle/heeler mix does neither.
I was going to say that. I had a girlfriend who knew a couple with a pair of samoyeds. I never met the dogs, I never met the dogs’ owners, all I got was the hair that would land on her jacket which would then transfer to the inside of my car. Even after we broke up I’d see the occasional samoyed hair drift by as much as six months after.
K9bfriender has it completely accurate.
It’s the double-coat breeds that shed the most hair, and the bigger the breed, the more there is to shed. (These are mostly outdoor type, and usually in the herding dog class. Which is one of the smartest of the dog classes.)
The long-haired non-shedding types (poodles, etc.) don’t seem to shed as much, but they take just as much (if not more) effort – their hair doesn’t fall out on its own like the double-coat dogs, so you have to remove it by currying, combing, or bathing them. A dog vacuum really helps. Or you can get dog-combs that attach to a regular vacuum. (We used a big Electro-Groom horse vacuum – more powerful, and works longer before you have to empty it.)
The short-hair breeds shed just as much, but it falls out on its own and you don’t notice the short hairs. Especially if they are not white-colored, that shows up on your clothes.
And note that the shedding is seasonal. It happens based on changing hours of daylight, so even in places like California that don’t have any real seasons, dogs will still shed their coat twice a year.
I had a husky mix and he shed quite a lot, and blew his coat twice a year, spring and fall. By blowing his coat I mean the hair peeled off of him like the pad that’s underneath a carpet. Like it all would have filled a container three times the size of the dog, every day for a couple of weeks.
And now I have a border collie mix (BC and what, we don’t know. Many likely suspects). I have never seen a dog shed so much all year around. He doesn’t blow the coat like the husky, it just goes on and on. There are a couple of weeks in the spring and fall when he DOESN’T shed, at least not as much.
I brush off before I leave the house. And yet: His hair is on my chair at work. It’s in my car. It’s in my friends’ cars if I’ve been in them. It’s in the gym I go to. There could be a residue of it anyplace I’ve been. It’s probably on the H line train, maybe even in your house.
To see him, it doesn’t even look like he has that much hair. He’s just a dog-hair-growing machine. But cute. And he only needs a bath every three or four months. (I once had a dachshund/beagle mix who didn’t shed much, but she needed a bath, like, weekly. She also got skunked and smelled like a skunk for a year even with weekly baths.)
I have a friend with two Samoyeds (why do people with Samis always have two?) and he complains about their coats, but my dog is worse than both of them together, because it just goes on always and theirs is mostly confined to two times a year.
German Shepherds hold the prize for year-round copious shedding. Nordic breeds like Samoyeds, Malamutes, Huskies tend to be twice a year only but make up for it in volume.
Among dogs I have owned, show-bred Pembroke Welsh Corgis are astonishing for this quality – they once had rather ordinary double coats but were selected for “plush” coats with so much undercoat their fur almost stands straight out instead of lying flat. You could stuff a bed from one dog’s output.
I remember lots of hair in spring and fall from our pure Husky, we always joked we could make another dog out of the hair!
There’s a question of proportional vs absolute. A big dog might shed more stuff than a small dog, even though it was a type that technically sheds at a lower rate than the smaller one.