Ok, I have a 2 year old Belgian Malinois and all of a sudden she has started peeing in her bed in her crate. She is perfectly house trained and has not had an accident in the house since she was 6 months old. I know her crate is not too big, because that is the first question I researched. We take her out before we leave the house or put her to bed for the night and she only does it when we are gone. She is normally not locked up for more than a few short hours. Any advice??