[yorkietalkjilly]

Here are some thoughts for your consideration. When things change in our dogs' behavior, they are often signaling they don't feel well, are hurting, maybe it's a toothache or whatever or he's upset/troubled by something else that's frustrating or upsetting him. I'd have a vet check him first thing.

Try Googling 'why housebroken dogs lose their housebreaking' or some similar phrase. There can be several different things going on.

Dogs have few ways to express their feelings and any change in behavior is a powerful communication. Dogs often urinate/defecate for many reasons to express that they are dealing with all sorts of issues they find troubling or trying to deal with besides eliminating waste. Often dogs pee/potty on our belongings or in our beds, chairs, etc., because they have great concentrations of our scent on them and where they draw more comfort. No doubt something is troubling your little guy and having all his old, well-known scents associated with the former flooring in his territory summarily removed and missing might be it or it could be something else such as he's fearful of the new flooring, objects to its odors or a new dog in the neighborhood whose scent he's picking up on or maybe a neighbor is having loud house repairs, practicing drums or trumpet during the day when your're gone and he's fearful of what that noise is.

If the vet gives him a clean bill of health, dental and otherwise, I'd try confining him to a single area covered in pee pads when I couldn't be with him and when I am home, keeping him in the room I am in so you can monitor him and take him to his appointed potty place frequently, encouraging his greatly when he goes there.

You might try leaving a nanny cam or something out to try to find out when and what seems to be going on when he marks.