Taken aback by the second shock of his words, you come to quickly and your lewd thoughts dissipate in an instant. Surely there's something odd about this house, right? You were probably too mesmerized by padding your butt to realise what was going on. Thankfully, it seems that this dog man isn't going to throw you in a cell for trespassing. He says, "I knew security should have been tighter... but anyways, come follow me. I can explain."
You agree, and follow him. By now, the fact that you are a furry with only a soiled diaper for covering your body is starting to set in, and you feel yourself turn bright red - doubly so since you basically donned the transformative item out of curiousity. Honestly, though, the blow was softened by how good you look - you feel a bit more muscular too, but you might feel even better if you started working out. Granted, you are trying to think if everyone would know if you went to the outside world, but as you pass back up the stairs, the dog man starts to talk to you.
"This house has been warded against intruders, since it was made to survive the upcoming apocalypse... Don't believe me?" he says, as he leads you into a room with seismographic equipment and computers. Indeed, it seems like there are earthquakes all around this place, but none that seem to harm this house. He sits down, searching the web, and before long you can see news articles of freak activity in the outside world, from earthquakes to warfare. Pretty shocking shit, but you take comfort in the fact that you won't be publicly seen in this rather embarrassing state.
The dog man then turns to you, saying sternly, "Beast Briefs were made to help us adapt to the outside world after the collapse, so that we could live on minimal supplies, and evolve into higher beings. We... usually need to keep wearing them... or we might experience side effects not as desirable as the usual drawbacks." You can see he's trying to keep a straight face with this, but is doing quite well in that regard. "Pretty much all the weird things like pooping a lot are... necessary, whether to help with the physical transition or improve your health, but it's all in the name of survival... though, if you aren't too keen on walking around with full pants or compulsively pooping yourself, we have an alternative." He points to another box in the room, though this one, despite the similar branding, seems to be men's underwear (right down to the cartoon wolf mascot wearing one himself).
Soon enough, you discard the soiled brief and put on a new one of your choice (whether it's a diaper or underwear doesn't matter until the end of this chapter). Then, he turns to you and says, "You may want to do your best to look inconspicuous, lest they find you are an outsider. But for now, I can help you blend in. It's probably for the best, since I don't think I will be able to help you much if you are exposed as one... though, maybe they won't mind too badly if you prove yourself useful."
You agree to this. Now that you understand what the situation is really like, you just need to figure out what to do next...