Hi. I have 2 Jack Russells that stay outside during the day and do their business outside and at night come in to sleep. They are taken in at 7 PM after being made to pee and are put to bed at 9:30 PM after another pee. Sometimes (once a week) the female (who is spayed), pees on the blanket where she sleeps. She sleeps together with her brother in a dog bed. Both dogs hate peeing on the cold wet grass at night but do fine during the day. She doesn't bark or scratch to go outside - she just pees in her bed. Both dogs were crate trained and didn't pee in their crates. What can I do ?