[header] How to react if you find a lost kitten or cat [title] Look for signs that the cat is lost. [step] It can be difficult to tell whether a cat is truly lost, or if it is allowed to venture outside its home. The cat may also be a stray with no home to return to. 
In general, if a cat seems healthy and calm, you may want to leave him alone. If they seem malnourished, injured, or afraid, they may be either a stray or a lost pet.