I think 5 months old is WAY to young to assume that a puppy (or two) would make a good decision on their own. I wouldn't trust mine (she is also 5 months old) for a second - and that is just one puppy, not two! They also shouldn't be left out and given a chance to harass the neighbors livestock. Again, they are way too young to know any better.
Leyna vom Grunenfeld, HT, PT, HSAs, HRDs, RLFs
Paisley vom Kirschental, 3/25/13, aka "the devil"
Levi vom Grunenfeld, RIP 9/5/04 - 3/4/13