sounds like he is re-marking his territory.
but if he might have a medical problem do check for that.

we have a spoiled pointer mix - she thinks it is ok to run an jump on the couch and sleep on the couch {daddy lets her do it}

but I just have to be firm and consistent to retrain her to stay on her blanket on the floor - esp now that the rains have started - dirty feet and belly - ICK {at least it is faux leather}

terriers are very smart and jacks can be very full of them selves
{ my sis has one so I read up on temperament}

but a dog is a dog- consistency and firmness {not meanness} and lots of reward/praise when good - plus the crating will probably break the habit
and cleaning all the spots too.