[CLEO & CEASAR]

I hope somebody could help me.:We live in an apartment complex and i went out to do laundry. So I left my husband taking a nap to load the laundry and left the dogs which I always do all the time. I came back after four minutes with my husband awake and mad. I asked what happened and he said he woke up and felt Cleo on top of his body pillow and felt something wet on his skin. It turned out Cleo peed on him. What was that behavior about? Could somebody help me? My husband was so upset for 5 minutes. He can't stay mad for long because he loves our two yorkies. And by the way ...Cleo and Ceasar are already 3 years old. HELPPPP!!!!