re: Pet owners question: crate training and leaving dog out to roam

i have a 1.5 yr toy Australian Sheppard, we got lucky enough he roams free in the house (all rooms doors closed) till my boys get home at 3 from school. Now we have another Sheppard about 4 months old - he's being crate trained,if i let him loose - he pee all over the place, not bladder control yet.