What are the top 5 that you see?
Labradors, cockerpoos, spaniels (springers and cockers), german shepherds, dachshunds. In no particular order. I see a lot of overseas dogs as well. And yes before somebody points it out, shepherds can do a lot more damage than a dachshund. Collies are also up there.
There are also some breeds that are instinctively less trusting of new people or animals and people need to be aware of that. Spanish mastiffs, anatolian shepherds, the sort of dogs that guard livestock.
I see the occasional mastiff but the amount of the above far outweighs these. Some might argue that the people that own the dogs I see care enough to hire help and work on things, but when I do work with my mastiff owning families, they are just as committed - and take steps like muzzling more seriously than some.
There will always be people out there that don't want to work on their dog's aggression, too, or go it alone (and make matters worse).
Unfortunately XL bullies do attract not the best owners sometimes.