I had 3 last year. When I added the 3rd it really wasn't that much more. Now? After adding a few more, I have 5 and special baby Tia will make 6 !!! I have 3 Yorkies, 1 Pug, and two Chi's.
My husband and I both work Full Time outside of the home and I'm mostly on my own in the taking care of them part.
Dogs are my passion, so if its something you really love, go for it....usually when its something you really love, the added work doesn't bother you.
Good luck and keep us posted on your decission.