My two and a half year old Westie (neutered at 9 months) has just recently started to make his "mark" inside my dog-sitters' house. He has stayed there many times before (once or twice a month for a couple days while I travel on business). They have a three year old, spayed Westie. "Marking" has never been an issue in the past, until the last three visits. He doesn't "mark" if I'm there, or if I leave him there for a couple hours. But, when I'm out of town, he has started a morning and evening ritual of hiking his leg indoors! He does not "mark" at home.
Any suggestions on how to stop this bad habit?
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