Dear Dr Dan
Thanks for your reply.
Duke was fully house trained from a puppy with no problems. This situation started about six months ago. Often it is only a small amount of wet as if he is 'marking' his territory as it were. he clearly knows he has done wrong when he sees me 'inspecting' I think he has a weak bladder rather than this being a behavioural problem but of course that's only a guess. In every other respect he is a very healthy lively Labrador He is Kennel Club registered and his injections are up to date.
No apology needed for the delay, I know how busy you must be.
Regarding our own Vet, no, no urine test was done when we took Duke two weeks ago for his annual injections. Unfortunately 'Kirsty' the vet who has looked after Duke since birth has moved on and the new vet is very different, her only advise was to have Duke castrated, some thing which I thoroughly disagree with in any event. I know enough about anatomy and physiology to know that would not solve the problem
Hope this helps