outside potty training

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I have a miniature Akita...Sheba Inu. She is about a year old. We are having trouble getting her to poo outside. She pee's outside and is rewarded when she does but we can only get her to poo on a pad and she usually does this when we are asleep at night. We take her out whenever she asks and allot of times she does nothing but sniff around. She is a very smart dog and obeys in every other way. Any suggestions on how to get her to poo outside. Oh, if we don't put a pad down she will still go but on the floor. thanks