I have two dogs, a 5 year old Havanese and a 3 year old ****zou Maltese. They were housebroken but in the past 6 months they've both been peeing all over the house. I walk them often and they have a huge back yard to run around in. I scold them and put them outside when I catch them but it's not stopping. I am at my wits end. They have ruined carpeting in two rooms and are working on others.