Might be The Padalecki Curse (http://spiders-stars.livejournal.com/1189.html) by spiders_stars and its sequel (http://spiders-stars.livejournal.com/5401.html). Summary: Three days out of the month Jared is turned into a dog. It was just a curse he had to deal with. And then he met Jensen.
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Summary: Three days out of the month Jared is turned into a dog. It was just a curse he had to deal with. And then he met Jensen.