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That is a super cool idea!
My first thought was questioning if she did any DS prior to them being on the wall. I thought this because my guy, Titan, is sensitive to the slightest environmental changes. He notices when anything is out of place or, not the same as he last encountered it! (in the beginning of his B-Mod, any environmental changes caused him to stress eliminate in the house for 2-3 days after exposure.) Had I been familiar with this technique, I probably could not have used it on him specifically. I do think this is a great way for not only most dogs but for most people. It is convenient and user friendly for the person (if they are in the early stages of learning timing or handling skills for example) and as you mention, no pressure on the dog to engage with it.