GringoPost | Cuenca, Ecuador: Scratching dog

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Scratching dog

A couple of days ago there was a post on a medicine that helped dogs stop scratching. Can't find the post but would like to know the name of the medicine and where in Cuenca I can purchase it. I am older so comments like "any good pet supply store" don't mean anything to me. Name and location if possible.
Thank you,

Jerald