Weeze (et al) This expanation may take a bit, please allow me to copy and paste from a commonly quoted article:

History of the Chemdawg Family

At a 1989 Grateful Dead show at Deer Creek Amphitheatre, 'joebrand' (aka 'wonkanobe') and 'pbud' met 'chemdog' and sold him an ounce of very high quality pot for $500. joe and chemdog exchanged numbers and they later arranged for two ounces to be shipped to chemdog on the east coast. According to chemdog, one ounce was seedless and the other had 13 seeds.

In â??91, chemdog popped the first 4 seeds. From these seeds, one male was found and disposed of (chemdog was young, you canâ??t blame him). The 3 females were labeled â??chemdawgâ?? (now â??91 chemdawg), â??chemdawg aâ?? (now chemdawgâ??s sister), and â??chemdawg bâ??. In '01, chemdog and his girlfriend attempted to germ 3 more seeds, labeled â??câ??, â??dâ??, and â??eâ??. the â??eâ?? seed never germinated, â??câ?? turned out to be junk (according to chemdog), and chemdawg â??dâ?? was the keeper. In '06, 'chemdog' and 'joebrand' reunited and joe was given 4 of the last 6 beans: Chemdawg phenos 1-4, '4' being the chosen keeper. Joe thought the '4' was the best representation of the original and thus dubbed it the 'reunion pheno'. Chemdog still has two seeds left in his stash.

Chemdawg Crosses:
â?¢ 'OG Kush' (the original cut) came from an s1 from in a bag of '91 Chemdawg in the Lake Tahoe area in 1996.
â?¢ 'Sour Diesel' aka ECSD came from an accidental cross of ('91 Chemdawg x Mass Super Skunk/NL)x DNL after the DNL hermed and seeded the room. The DNL's lineage is NL/Shiva x Hawaiian.
â?¢ Original Diesel' (also known as Diesel #1, Headband, Daywrecker Diesel, Underdawg) came from a cross of '91 Chemdawg x (Mass Super Skunk x Sensi's Northern Lights) done by a guy known as â??weaselâ??.

â?¢ 'chemdog' and friends made several crosses that are held closely by a small group of friends and acquaintances. Among them are:

1. Super Snowdawg (Bubble Chem x [Super skunk x Oregon Sno])
2. Giesel (Chem D x Mass Super Skunk)
3. Bubble Chem (Chemdawgâ??s Sister x Sag's Bubbleberry)
4. Dawg Daze aka ChemHaze (Chem D x â??93 Sensi's NL#5/Haze)
5. Chemdawg D x Pbud (another old-school Colorado strain)


Rezdog of Reservoir Seeds recently released several Chemdawg crosses as part of his 'Trinity' charity auctions. The crosses included Chemdawg D x Sensi's Hindu Kush and Snowdawg x Sensi's Hindu Kush, Chemdawg D x Sour Diesel IBL, Snowdawg x Sour Diesel IBL, ChemHaze x Sour Diesel IBL and Giesel x Sour Diesel IBL.
So it's from unkown genetic, but a classic component of many modern strains held in fairly high regards. My seeds came directly from Rezdog. They are intermediate products as he is working to breed Chemdog into an IBL.

I was actually able to get my hands on a fair quantity (50 each)of his seeds. Rez produces seeds that actually are decendants of Chemdog and The original keeper of the strain has repeated verified the origins of Rez,s genetics and has given him his blessing to work the strain, unlike Arjan from GreenHouse seeds. It is in fact the real deal, "bottled in bond" genetics. Arjaqn's straion is from an "apothicary" cut which cannot be verified to actually originate from Chemdog's original seed stock.

The best part that Rez is very helpful (although sometimes rude) and is very open source regarding phenotypes, care and feeding schedules, etc. If you are interested in more info he has a presence at ICMag.