Jet sometimes resource guards the sofa and bed, and when he is forced off he aggresses.
Part of his behavior modification is creating a positive association with people coming towards him. With a happy tone we announced our approach, then gave him a treat. Soon Jet was looking forward to us coming near him. We then taught him how to get off the couch on cue which, after several repetitions of being reinforced for doing, he was more than happy to do!
Jeff Dentler, CPDT-KA, FFCP, CTDI