Heat oil in medium skillet over medium heat until shimmering.
Add onion and cook until softened, about 4 minutes.
Stir in garlic and cook until fragrant, about 30 seconds.
Stir in ground meat and cook, breaking it up with a wooden spoon, until no longer pink, about 5 minutes.
Stir in tomato sauce, chopped tomatoes, chipotle pepper, adobo sauce, and Brown Dog blend.
Simmer uncovered until thickened, about 10 minutes.
Season with salt to taste.
Use as filling in soft or hard taco shells or flour tortillas.