Keep your cats off countertops, off furniture, out of your living room...away from anywhere you designate.
Most pet fences and wireless indoor pet barriers work in conjunction with a shock collar for cats or dogs that will deliver a mild static correction when they enter areas that are off limits.
Training mats such as the PawzAway and Scat Mats do not work with a shock collar; instead they deliver a static charge simply when a cat or dog steps on it. Other training devices and deterrents in this section include products that use spray like the StayAway and Ssscat, or sonic/ultrasonic such as the Dazer and Sofa Scram.
These products are amazing and will quickly train your toy breed, small dog or cat to stay away from forbidden areas.