Best Dog Training Methods

How can i keep my dog in the house at night knowing she wont poop in the house? i put her in the backyard with my other dogs at night but i don’t want to cause she’s a house trained dog and i don’t want her to get fleas when she comes in?
my dog was trianed to go outside by previouas owners
previous*

Crate training is an excellent way to keep your carpet poop free. Buy a crate (I prefer wire crates) make sure it is large enough for the dog to stand up and turn around in. Simply put the dog in the crate at night. The first few days to weeks the dog may cry and bark a lot, it is VERY important that you do not let the dog out when he’s doing this. It will teach him that if he barks/crys long enough, you will give in and let him out. Ignore him. I find putting the crate in the bathroom with the bath fan on helps. The white noise of the fan helps them fall asleep faster.