So was there ever an official statement saying "no dogs no gangbangs" or are you just all speculating ? Nothing against it, it's something to do between 2 releases, I understand.
If indeed there was no official statement, I tend to see the officialisation of chapter 4 as time to go towards these goals. I must admit I don't have much hope about the dog, but I don't see why gangbangs or orgies would be so far fetched. Sure it's hard to imagine believable enough story points for these events to happen, but it's not like the premise of the story was super realistic in the first place, and it was all sufficiently well told so that we collectively agreed to believe it.
Some of you are comparing DmD to Melody or Sunshine Love, and you're forgetting that those games are on Patreon and DmD isn't. If I was in MrDot's shoes, I would like to have a game where I have more freedom to explore more extreme fetishes to counter balance Patreon's biggotery. Aka "let's make porn as safe and family friendly as Disneyworld".
That's why I can see MMF, gangbangs, and orgies in the future of DmD, and maybe a dog. As long as there's no foot fetish, too much lesbian sex, sex with food or hard BDSM I will be happy.