To not go on sofas
My puppy Wolfy has been allowed to go on the sofas in the living room all his life. Recently, he has taken to peeing on the sofas and thinking that they're his. How can I correct him when he goes on the sofa's and get him to go off? I realise its going to be hard because he thinks he's allowed but any recommendations?
Wolfy - Black and Tan GSD [Born 5th July 2010]
R.I.P. Snoop - Black and Tan GSD [Born 2004]