Honestly, the leather on car seats and the leather in couches isn't much different, it's all tanned hide.
It might be a bit heavier in cars and coated more thickly, but I imagine coatings on each are similar enough that the car care products will work regardless.
There's probably a good number of leather cleaners that can help remove some of the dog oil stains. The only thing I might recommend against is a conditioner if you are going to use an actual coating to protect the surface.
Adding oils and softening agents seems like it would keep the coating application from adhering to the hide or manufacturer applied coating.
I just did my entire interior with the pinnacle black label leather and vinyl coating and I can tell you first hand the seats and steering wheel both feel amazing. Much easier to slide around in the seat, and from what I've been told about light colored leathers, it keeps blue jean color transfer from sticking to the seats.