It takes a while for the testosterone to get out of their system, so yes, it's possible that he may stop the marking behavior. It's also possible that he won't. In the meantime, if you're not already doing it, you need to clean all the spots he's sprayed with an enzymatic cleaner. This will break down the urine into it's elements so that the smell goes away. If you use something else, you may not be able to smell the urine, but he will, and will continue to spray these spots.
You need to find ALL the spots he's sprayed. Get a good black light and a pile of pennies. When it gets dark out, shut off the lights and turn on the black light. Mark anything that glows with a penny and then start cleaning. If he's sprayed the carpet or furniture (anything that absorbs), you really need to soak the area around the spot as it spreads wider as it soaks on. You need to apply enough cleaner so it soaks in further than the urine did.
Good luck, I hope he stops soon.
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Holly, Misty & their friend, Jake, the dog.
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