We live in the country and i do think they hear much more than we do as their hearing is 6 times sharper than ours i think, another thing i do is leave the patio doors open and soon as they have done what they need to they are straight back in as i always have a treat for them , but only last thing at night, when i first taught quiet i went out and stayed with them when they started to bark i said quiet and if they didnt stop i brought them in and tried again a few mins later.