to pee or not to pee, that is the question?

Since Pork recently came home from his long visit to the grandparents, he has slowly ease himself back into our pack. I am noticing though that both dogs love to pee on each other's beds. It got so bad, we are now thinking we should get rid of the beds all together. We have nested donut beds downstairs for them to lounge and sofas all over the house so they always have a comfy, soft place to stretch out, prop their pillows, and nap their puggy stress away. Since they sleep in bed with me at night, I figure their nested beds may need to go. They have lifted there countless times. But the funny thing is, they don't do it anywhere else, except for their own nested beds!