Keeping doggies from jumping on a gate can be done several ways. It is best if the gate does the correction.
1. My hubby cut a piece of plexi glass the width of the door frame.(Actualy he had the Lowes guy cut it.) We use these as our gates The dogs have nothing to catch their claws on. You can also have it cut taller than a normal gate. Decorative drawer knobs (4) hold the plexi glass. Simply slide the plexi glass up above the knobs to remove it.
2. You can tape poster board (or card board) on the gate. I don't like this as much as option # 1. Because some dogs chew on it, and they can not see out.
3. Save empty plastic soda bottles and tie them to the gate, like wind chimes. Keep the strings short. You can use garden string, yarn or twine.The idea with this is it make the gate feel wobbly as the bottles move.
4. A clear plastic shower curtain can be used on a tention rod inside the door frame to cover the gate. Heavy plastic shower curtains are easy to cut to the size you want to use. Make sure your dog is not a chewer if you try this.
5. You can be the gate police and correct with a firm, 'OFF' every time they jump on the gate.
Hope this helps.