I have 2 young cats (18months), a neutered male and spayed female A very unpleasant tom cat from down the way somewhere is terrorising them. We have a catflap that only lets in our microchipped cats and we frequently hear them racing in with a great thud as the tom crashes into the locked door. Female cat is braver and tries to punch the Tom through the catflap but the male is becoming increasingly more fearful and is hardly going outdoors. We spray the Tom with water whenever we see it in the garden but he doesn't care and keeps coming back. Any tips for scaring him off?