My 8month dog had not had any accidents in the house for several weeks and is trained to ring the bells on back door when she wants to go out, which she does frequently. Having now come out of her crate at night and now sleeping in basket on landing she even comes into our bedroom to wake us up if she needs to toilet in the night/early morning. However twice this week she has suddenly, without any warning, peed on the front room carpet right in front of us. The first time I had been playing with her and I put it down to excitement, I quickly interrupted her and ushered her out the back door where she finished off! The second time we had just come in from a long walk, on which she had peed. Again without any warning she just squatted on the carpet, I quickly ushered her out the door but because she'd been on her walk she'd finished anyway. Is this common to have accidents like this or do you think I should go back to treating her for pees outdoors? Many thanks for any advice.