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Step 1
Invest in screens!
A cat will learn to stay indoors, but not if doors and windows are frequently left open for more than a few minutes at a time.
You will need to screen your windows and your doors if you want to leave them open for regular fresh air. -
Step 2
Reprimand the cat any time he goes near an open door.
The best way to teach a cat to stay in the house is to teach him to stay away from open doors while you are unloading groceries or other similar "open door" times in life. A sharp "hissing" noise will be naturally unpleasant to the cat and he will streak away from the open door he is cautiously approaching.
This caution is natural - the cat is in territory he knows and claims and sneaking up toward territory he does not know and does not claim. -
Step 3
Reward the cat for moving away from doors.
A cat treat or petting are both good positive reinforcement when the door is standing open and the cat is choosing not to investigate it.











