Very likely it is the cat coming into his territory that is upsetting him, especially as he is spraying near the windows where he can see the cat. That definitely sounds like he is marking his territory and his seeing the other cat is causing him stress. You need to discourage the other cat somehow. Does your boy go out in the backyard at all to mark out there? If not you could try some of the products available in garden centres to discourage cats, I'm not sure how effective they are though. Or invest in a water spray that is motion activated, that would probably work!
I bought a water pistol to see off a local cat that upsets my two. Now and again he still comes in our garden, but legs it as soon as he sees me!
The only other thing is that if this is happening at night, can you stop him having access to those areas so he can't see the other cat coming into your backyard?
_________________ Clare Hendrix and Jagger, Brown Marble Boys (born 18 August 2013) Hampshire, UK
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