I rescued mine and they came a week apart. The first a 3yr old timid female followed by a 9mth old boisterous male. I had no choice really, i would have loved for us to all have bonded at the start but didn't have that luxury. To add to the whole affair, the male came down from interstate and was straight to the vet to be desexed. So it was scary for all of us, but it has worked out so well. Oh, they also were not toilet trained!!!
They have full run of the house and outside (doggy door) and that too was scary for me... what damage would they do, toilet surprises, but i had to trust them to see what would happen and they have completely surprised me, they are wonderful together. I throw down a few liver treats on the kitchen floor and make them sit for a special treat then grab my bag and say 'Be Good Kids' or something like that. I have also succeeded now with their toilet training, i never thought that would happen.
Having 2 dogs can sometimes be trying with training and all that, but i believe that it's positives far outweigh the negatives.