I'm in the boat that this is "weird." I can't really think of it as "wrong" though. The most harm I can think of the situation generating is the dog getting inappropriate nourishment (dairy lol), and the woman indulging in what I interpret as being a mentally unhealthy behavior. As far as sexual acts with animals, I'm of the opinion that it is ridiculous and you should probably get help if you are so inclined, but you can do what you want with your animals as long as you aren't causing them any more discomfort than the society's status quo.
This is what I'm getting at. Like I said, I really don't care what you do as long as it's not hurting anyone else. You can tell me you eat human excrement and I would just smile, nod, and hope you don't go into detail :lol-sign:
Do I think this woman has an issue if she truly thinks this dog is her child? Yes. Does it bother me? No.
Not something I would personally do, as getting my boob bitten isn't on my agenda, but I really try not to judge something because it's weird.
Docking and cropping are way way WAY more unnatural, and I don't have a problem with those either, as long as it's done with as little discomfort as possible. Would I do it? I don't know. But again, I'm not going to judge.