Sheldon rarely barks usually only either at things he just discovered made a noise or opens when it shouldn't as well as things out of place. Nothing should ever be out of its place.
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Daisy is the same way! lol I read that on here awhile ago that bullies are ocd about things being out of place... She soooo is! Lol She walked down stairs one day and there was a new box in the basement. .... She so did not like that. She barked at it and just stood there staring at it for the longest time... lol Silly bullies