My dog is completely house trained, but for some reason likes to pee on absorbent things. I bought her a new bed and lately she has been peeing on it only an hour or 2 after being walked in the morning. She also has a thing for certain rugs. She has another bed too, but that one she doesn't pee on, Why does she only pee in certain places. I also took her to a friends last week and she went right to my friends shaggy rug and squatted. What can I do to prevent this behavior?