On the bestiality stuff, there is a planned "pet" route, but that doesn't mean that a pet route will literally involve a pet (dog) having sex with D. It could be a route in which D/F get a dog , as they have been to the pet store in Ch3 and you could pick "small" or "big" dog. D has talked about getting a dog a couple times so far in Ch3, once before the pet store visit and once when they went to the park and D talked about walking a dog in the park.
So, I think its likely they will get a dog, it doesn't make sense to have the previous stuff I mentioned without getting a dog, which would be a pet route, but that doesn't mean they will do anything sexual with it. Jeff Steel has said he isn't a fan of bestiality, it doesn't fit D's personality at all, so I think the odds of dog sex is very low if any.
If people want D to fuck a dog, go play
Our Fathers or something. Its a DMD parody game with optional beast content.