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How to catch a stray cat
Observe the cat for a while.
Before you catch or even approach a stray cat, you need to observe them for signs of disease and injury. For your own safety and the safety as a cat, it's important to evaluate the health of the animal and come up with a viable plan for determining when and how to help.
If a cat has been frequenting a particular area for a few days, spend some time watching it closely. If it's a friendly cat, your job will be a lot easier.