No, I don't believe it will stop his marking but I do believe you can train him to stop if you have hawk eyes and put him in belly bands.
I did Yorkie rescue and I have 6 of them and the boys still will lift their legs even though every one is fixed/spayed. The one I don't have a problem with is the dog that was neutered at 3 months of age.
Good luck and this can be corrected so please don't send him back.
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