milly 😡annoyed

Question for kitty owners?

Our 4 year-old male cat, Keith, has starting peeing inside the house. He usually will do it at the doors, occasionally near vents. We know why he's doing it - there's a stray male that decided our yard was his territory and has been liberally marking our front porch and all around the outside of the house. 

a) Do you guys know of a way to encourage him back to his litterbox? We know the box itself is not the problem, because he still poops there.
b) Is there a way to discourage the stray cat?

At this point, we're probably gonna borrow a trap from the shelter and then once we get the cat we'll bring him there to get fixed. But until we can do that... I'd appreciate any advice on getting him to stop the peeing. 

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