Keep them indoors
The first and most basic thing that you need to do is to raise your cat as an indoor cat. Keeping the cat indoors will prevent it from going outside, which would significantly decrease its chances of being stolen.
At the same time, the cat is going to adapt and adjust to wanting to live inside, and hence even if it accidentally gets out, the cat will be looking to get back into the house sooner, rather than later.
The next best thing to do, is to install a tracker system in your cats collar. This tracker system will always be online and will constantly tell you the whereabouts of your cat and its location.
Most cat thieves don’t spend time removing collars, and should they steal the cat and take it with them, they would dispose the collar somewhere, near where they are residing. This in turn would make it easier to track them down and recover your cat later on.
Never leave the cat unattended
You must focus on never leaving the cat unattended. Try and always keep someone around with the cat, when you are going about your day to day routine. Also if you can’t keep someone with your cat at all times, try and leave the cat at a pet daycare, or take the cat with you wherever you go.
Get neighbours to recognize your cat
You need to get your neighbours and other people to recognize your cat, this way if a stranger is found carrying your cat around, they will be able to identify that something is off, and will be able to handle the situation.