Chemdawg, which is also known as "Chemdog," is a hybrid strain of marijuana that has been cultivated and propagated by the breeder Chemdog since 1991. According to an interview with Chemdog on Leafly, the strain originated from bag seed that was believed to have come from Northern California and was brought to a Grateful Dead concert in Colorado. The Chem 91, Chem 4, and Chem Sis varieties are all different versions of Chemdog. The name "Chemdog" is a combination of "Chem" and "Dog bud," which were two different names for the same strain. Over time and through various growers and breeders, the name has evolved into "Chemdawg," which has become more commonly used.

Users of Chemdawg report feeling euphoric, uplifted, and creative. It is often chosen by medical marijuana patients to alleviate symptoms associated with stress, anxiety, and pain. Chemdawg is a well-known strain in the cannabis community and has been used to create other popular strains such as Sour Diesel and OG Kush. The strain is characterized by its strong, diesel-like aroma that is easily recognizable. It is also known to be very potent, so inexperienced users should approach it with caution. Chemdawg typically produces a cerebral high combined with a heavy body sensation.