Normally, outside the USA, Complex & Bulldog Paphs are the same thing. Usually they can grow quite easily in much cooler conditions than most other Paphs. The flowers can last for 2 - 3 months. This depends on the size & health of the plant also. They are, for me, the easiest of the Paph family to grow.
Aha, now I know too. I've been wondering about the term "Bulldog Paph" for a while and thought it might refer to Paph bullenianum, but apparently I was far off. I don't like the Bulldogs then, now I know.