I could see all 9 of the females. I think Melbourne's four males should move in with these girls but unfortunately i don't think the males will ever be part of a breeding program.
I'm not good at estimating size but if you look at the picture below, it shows about one-third of the exhibit.
It is really good from a visitors point of view because the dogs den is in a perfect position to be watched by the public and i absolutely love african plants, of which there are many in this exhibit.