When Predation first started, we were running on a rather obsolete game making platform, and after that, a bad engine. When we switched over to where we are now, we realized just how lacking the game was, and how much more could be done with it, so we are in the process of reworking the level for a brand new, MUCH better experience.
As for why the dog is gone, Patreon came down rather hard on any content that involved feral animals. They went on to specify that an anthro furry paired with a feral animal is "rule breaking content", and any such content hosted on Patreon would be "dealt with".
As unfortunate as it is, we had to remove the feral dog, to prevent Patreon from shutting our page down completely. We did try to jump ship to Subscribestar, for much more freedom, but that's been a slow process.
The current plan is to finish up the last touches on the completely redone first level, and release the build to show all of the improvements, how far we've come.
If you ask me, as someone who was a fan of the project BEFORE being brought on as a dev, I've been a tad bit impatient, myself. I want to see the new content that's been added in a playable state. I haven't been given any specific deadlines, but I have been assured that it's nearly ready for a big release. After the first level is republished, we've already got the groundwork in place for the next full levels, and the engine built to handle it. It's just a matter of putting it all together.