How do I get my year old terrier mix to STOP going potty in the house??

OK...I'm not nuts or anything. Just give me some opinions. I have 2 indoor dogs; 4 year old terrier mix (male neutered) he is housebroke...and the culprit 1 year old terrier mix (female spayed). I just don't get this dog!! We go out a lot as I work and live on a horse farm. She will poop and/or pee outside and run around for long periods of time...come in the house and pee or poop!!! They both eat good quality dog food and eat early, about 5 a.m. Overnight...poops in the house! Almost every morning I get up and clean up. I'm thinking I should kennel them both overnight and maybe this will lick the p.m. problem. But what about the other times throughout the day? HELP