[Ellie May]

Please help. Ellie is almost 6 (not spayed) and whenever we go somewhere (petstore, visiting someone) she marks. This is mostly when other dogs have been in that territory. At home she usually goes inside when I'm not paying attention to her or she goes out of spite (for putting her in bedroom alone...). Does anyone have any idea how to get her to stop marking? If she doesn't stop she will have to start wearing a diaper when we go out.