My cat - Will, 2yrs old neutered boy rehomed by me 9 months ago - is being bullied by a local cat, Jerry. Jerry is 18 months old and neutered and has a very nice home of his own, but was around before I got Will, he was coming thru' the cat flap so I changed it to one that reads Will's microchip to stop him. He is now trying to smash his way thru the cat flap, they have huge fist fights from either side. The same is happening thru' the windows - Will sits inside on the window sill and Jerry sits outside on the window ledge and they scrap. Jerry seems to lay in wait for Will, who is now reluctant to go out. Will is far bigger than Jerry, but is unable to stand his ground. We have regularly soaked Jerry, even put the hose on him and knocked him off the fence with the water jet and sprayed him with water through the cat flap, but nothing seems to deter him. When he sees me in the garden he comes over to me like a long lost friend! We have a detached house with large garden (as does Jerry) so they're not forced to share a small outdoor space. Suggestions please??