I think you should keep your pet cat inside, too, for the cat's sake and for the sake of the cat not murdering its way through the local bird population for fun.
But saying you saw a cat so you can do harm to it is absurd and sadistic.
Dogs. The barking. Shut the **** up at 4:30 AM already.
I wouldn't purposely do harm. But I'm also not going to avoid putting chemicals on the lawn or put poison out to kill the mice under the shed just because the neighbors let their cat do whatever it wants.
I also agree on the dogs. We've had several dogs. That's the one thing that I was especially conciuous about because I know how annoying that is