Chem 91 grown by Alvarez Cultivation. Much like many other members of the Chemdog line, the origins of Chemdog 91 are shrouded in mystery. Rumor has it that the lineage was first cultivated by the illustrious East Coast breeder who also goes by the name of Chemdog, and some speculate it descends from a Thai landrace strain . Chemdog 91 is thought to be an offshoot of the original Chemdog strain, and the numerical addition of “91” is believed to reference the year the strain first came into existence. Some growers believe Chemdog 91 to be a cross between Chemdog and Skunk , which may explain its particularly pungent aroma.