...sudden. He has been HB for yrs? he has been house broke and crate trained since he was 8 months old. we have nothing new going on, and we can not catch him doing it,it makes sure he is out of sight, because he knows he will be in trouble.
It is possible it's a medical problem! If the dog has a Urinary Tract Infection (UTI) or some other type of bladder infection, it could be causing him to urinate quite frequently and he just can't wait until he gets outside. Since he was previously perfectly housebroken this may be the problem. Most of these infections are easily cured by a round of antibiotics! Obviously a trip to the vet would be necessary.
If not, then maybe he's angry at you/your family for something. Not spending enough time with him? Not taking him for walks? This sounds slightly ridiculous but some dogs do it!