Like Lori Jordan I used the severe scolding, and immediately took the dog outside. The peeing on the bed episodes in my house happened with two different dogs. One was an excellent dog who was house broken in days as a puppy, and the other was well....Hannah....who was very difficult to house train (it literally took 2 years).

In both cases a severe scolding was all it took. It did not become a regular occurance, athough if I remember correctly, Hannah did it on two occasions.