@Gentlemancorpse is correct, the Dog Patch male is Chem D x (Chem '91 Bc2) from Lucky Dog Seed Co.
The Chem D x Dog Patch is sort of a backcross. I haven't had anyone in the Chem family verify my Chem D cut or anything haha, but I do my very best to only source/work with cuts from reliable sources.
Just like with my Triangle Kush x (Black Triangle F2), I haven't had Bodhi verify that the TK cut that I used for that hybrid is the same TK cut that he used to make the Black Triangle with haha.
Due to it being Black Triangle, I like to refer to that as a "blackcross" haha, which I will also do with my Chem D x Dog Patch hybrid. Or Chem **3 (exponent 3), lovingly.
I only made a small batch of the Chem D x Dog Patch seeds (enough for myself to look through a nice population), in hopes of finding a nice male and using it to pollinate the Chem D again to make the first legitimate backcross to my Chem D cut. All of my Dog Patch females and males were sexually stable, which I was pleasantly surprised by, with there being so much Chem in the lineage. From the Chem D x (Chem D x Dog Patch), I hope to continue to backcross and find something that is as good as the Chem D cut, but also more sexually stable and doesn't throw stamens whenever she is passed. This all depends on me finding nice and also sexually stable males for me to work with. We shall see. Positive vibes...
~nugzz