Well.... not my yorkies..... they are all angels
yeah right! But actually... I have a teapot maltese that chewed up a corner of my wall...... I had to plaster and repair it just to have him do it again. But he grew out of it. I think he was teething..... but try bitter apples. Spray it on a few walls that he does like to chew..... the taste is suppose to make him hate it so he'll stop!
Good Luck!