I don't think my dog would like it at all, either.my 55 pounder likes the back but with the seats down. She gets a little freaked out by the closing hatch if I put her in the back without the seats down.
Same with my 90lb German Shepherd, but she's freakishly tall for the breed.My 90 lb Great Dane mix has mixed emotions about it. If he lays down it’s fine but if he tries to stand up he does this awkward squat thing that seems pretty uncomfortable.