@Bella Dea,
everytime they potty, show them it (dont put their nose in it, i dont think you would do that anyway : D )
put them outside for a whole day.
this separation anxiety might add to the speed the dog doesn't want to be alone outside, dogs are pack animals. therefore it learns quickly not to pee or crap in the house.
my dog peed in the house 3 times and crapped once.
but shes smart as **** and im very godo with dogs, hehe.