My dog recently has stopped urinating in the yard and instead goes on the sidewalk. I have to go out and rinse the sidewalk because it leaves a stain. Why does she do this? She does her other business in the yard. It's very annoying. It's not like she really has to go and doesn't make it to the yard. First, she only needs to take 3 steps to get off the sidewalk and into the yard and 2nd, she walks around the yard checking everything out. She purposely goes on the sidewalk to do her business.