Sure, cat owners should worry about their cats jumping out the window. I'm concerned with negligent/irresponsible cat owners. For example, what if I see my neighbor's cat everyday on an open window of a high rising building, and I warn the owner about the risks, and one day the cat falls. So my question is: Are you aware of cases in which owners were held legally responsible in those situations? Or do you know of a SPCA chapter lobbying for passing local laws requiring cat owners living in apartments above, say, fourth floor to install screen (safety nets) on windows? I know of apartments where different tenants have had multiple cats injured and die over the years. Unfortunately it seems acceptable for well-meaning though inexperienced cat owners to dismiss such real risks.