Dogs poo anywhere unless taught otherwise. With toddler twins you may
not have time for dog potty-training atm ;-) However, if you feed the
dog just one meal a day first thing in the morning, it will poo shortly
afterwards, so you can bag the faeces and dispose.

Janet.
I had toddler twins - now grown up - a long narrow garden and a dog. I
dont remember having problems. The top part of the garden was lawn and
shrubs and the bottom part was paved. Dog was walked with the twins on a
regular basis and obliged on its walk or at the bottom of the garden
where it was easy to clean up. Perhaps I was lucky but it was no big
deal, some dogs will mess anywhere and are tricky to train but I think a
piece of rough garden it can call its own might well do the trick,
fencing will keep the twins out.
kate