I think unspayed does get far larger ones than spayed does. (And if they have a litter then it gets bigger.)
Pixie was spayed at 6/7 months, and hasn't got one.....Bluebell was spayed much later and has a good sized one on her.
ETA: I don't know about the diffference in breeds but would hazard a guess that the larger the breed, the larger the dewlap.
......overweight bucks can get dudelaps!! :lol::lol:
dudelaps love it :lol::lol::lol:
Beau had one see, and he was a neutered lad
Buu had quite a large one but it went after her spay
i think if they are neutered as young as poss most girls dont develop one,