Next door neighbours are a nightmare as it is - but they have 3 cats, one of which hides in our garden and then attacks our two cats. I have had to take 1 to the vet because her back was badly bruised. The same cat has also scratched my daughter. The cat also comes into our home if I leave backdoor open; and also sits on windowsill staring in at us and hissing.
Next door's attitude is that is just the way cats are - but I feel under attack! Any ideas???