Bristle nose plecos usually get around 6 inches long. The word dwarfing is too broad of a description. What I'm trying to explain is, a fishes growth hormones are influenced by heat, food activity, light, waste pH, and space. If you are skilled enough, you can control those and keep the fish from growing without causing harm. One slightly OK example would be a channel catfish from a lake compared to one from a river. The river cat is bigger because there is more food, more space, a stronger current, and different water conditions. If you can replicate that in a home aquarium, you can keep the fish from growing until the living conditions are changed.