They look like that because they were badly cropped and badly posted (or not posted?). I would imagine they got that way from being taped one to the other at the top of their head. I've seen it from time to time.
Why not contact the advertiser and ask if they're looking to place the dogs together or separately? (As for the "rehoming fee", IMO it shouldn't be more than what the local county animal control facility charges.)I would get them, but I do not think i could handle two dobermans.