Hi everyone

Would be great if anyone could help with the following problem. Our neutered one year old male has been with us for a couple of months now. He is settling in really well, confidence is high, seems happy. But next door's female (spayed) is really aggressive towards him. When we're around, she keeps her distance. But our cat has just learnt to use his cat flap and we invariably hear sounds of a fight in the garden, rush downstairs and see our cat either being beaten up (he is submissive to her) or rushing in to hide. He gets so scared he poos everywhere and it goes all over him. How can we help him become more confident and stand up to her? Or is there a way of discouraging her from coming in and attacking him? We spray her with a water pistol whenever we see her, but she has just learnt to wait until we're not around to go on the attack. I've talked to our neighbours who said they are willing to try keeping her in two days a week but no more, but I fear this won't really help. Any suggestions?