Scams abound as well.
When we were looking for a dog, we were interested in a handful of breeds. Boxers, Pugs(My wife was, not me...), Mastiffs, Bulldogs, some other stuff I can't recall.
Anyways, it was amazing the number of scams we ran across. Someone would post pictures in the Charlotte area with information about whatever litter of dogs for sale. You text it, and someone would say, "Where are you located?" then "I just moved to (somewhere far away). If you send me cash, I'll mail you a puppy.". They put these posts all over the place, I'd see the same puppy litter pictures in completely different ads.
I feel bad for the fools who send them money and expect a puppy in a cardboard box punched with air holes in return.
In the end we found a real breeder half the state away, and met them in person, with the puppy we were interested in and we signed, no joke here, an 11 page contract and paid half of the payment in check with receipt. We also took copies of each others drivers licenses. That contract ranged the gauntlet from us breeding without breeding license to paying them $1,500 dollars or pick of the litter. To if we decide to rehome, we have to give the dog back to them to find a new owner. We also had to get the dog neutered in X number of months AND send them proof such as pictures and Vet documentation... It was nuts and also pretty awesome considering we were buying an expensive dog and they cared who the dogs went to.
They even brought the mother and father(who was 203 lbs!) so we would know what we were getting into.