<human>: He doggit, I inherited a 5 year old 20 lb rat terrier mix (her weight is healthy, she's bigger than average) from my grandma about a month ago (don't worry, grandma's fine, just too old to care for the dog), and she's a super good dog. Grandma lives in a house with a dog door and we live in an apt with no balcony or anything, so I was worried at first about house training. We walk her for a mile in the morning and a mile at night, and there were no accidents or issues... until yesterday. She didn't poop on her evening walk, and when we came home, we found that she had peed on some sheets we had on the bedroom floor. 

We resolved to keep the sheets off the floor from now on, and didn't think much of it. This morning, she didn't poop either and we began to worry. We searched our apartment everywhere for poop, didn't see any or smell any. We've decided not to feed her breakfast (half a cup of dry food, then she gets a half cup of wet food at night) in case she's having stomach problems. We put the baby gate up that will keep her out of the carpeted areas of the house, and I put a puppy pad in the kitchen for her if she needs it, although she's never used one before, I'm not sure if she'll get it. 

We're going to go buy some little treats to take with us on walks and feed her one every time she poops or pees to reinforce the idea that bathroom things need to be 1. outside and 2. visible to us, but other than that I have no ideas.

Can you summarize the given text in a few sentences?
<bot>: Dog peed in the house, has missed 2 of her regular poops. Besides giving her treats for positive reinforcement when she uses the bathroom outside, what can we do?