People who let their cats outside are idiots in my book. My friend's Whippet is in serious condition after he jumped the high fence in his yard to go after a neighbors outdoor cat. The cat got away in a tree and the whippet crashed into a fence at 40 mph and is not doing well. All sorts of head trauma but he will recover. If he would have gotten the cat, the cat would be dead. The cat's owner witnessed the event and still won't put her three cats inside where they will be safe. My friend keeps her dogs in her yard but this was temptation which cost the dog dearly. Next time the cat may not be so lucky..or he'll get hit by a car, poisoned, shot at, caught in a trap or stolen. Cat owners..this is not 1940 where it once was fairly safe for cats out side. Cats also are responsible for killing millions of birds and their babies every year plus other wildlife which deserve to live. My four cats have never seen the outside. Maybe they're deprived but they are very healthy and happy and safe.