I have a ten year old shih tzu who is well in health and up to date on all his boosters,worming,frontline.But in the last few weeks has started to pee on my kitchen floor,which is very usual because he's never done It before,and I was wondering if there is anything I could try or buy that would stop him from doing so.

Anything or anyone new to the house? If not I'd talk to your vet, maybe a urine test for an infection.