My 12 month old labrador has started pooing and weeing in the house during the night. He sometimes eats it. I've never caught him eating it but I know he does because there's sometimes bits left in the morning. I've knocked him down to 1 feed a day (morning) and I take him for his last walk between 10pm and 11pm and he always has a poo. Nothing has changed at home to make him do this. Any ideas please?