Your Bulldog needs a puppy! I tell you I hate the way I feel now, and the whole mess sucks, but to look back without my dog would have been even more empty. I still say take them all. All you need is a great vac to clean up the hair, and 4 cases of carpet cleaner and you are good to go.
Enjoy the puppy, however they are like kids, they grow up too fast.
Oh and your Grandmother has to have a huge heart. Running a rescue is alot of work, and noone ever gets the credit they deserve for doing so!