I think the jury is still out on whether dogs do well on a vegan diet or not. And besides, a canine diet is not one-size-fits-all. Many dogs have health issues, and what works well for one dog won't work well for others. And dogs have different dietary needs from humans. I'd be more upset by someone who actively campaigns for, say, getting every dog a forever home, and then goes to McDonald's and eats a Big Mac than if they went home and fed meat to their own dog.
By the way, I don't really like the word "fakers' in your thread title. That suggests to me that omnis who are involved with animal advocacy are just pretending to care about animals. I don't think that's necessarily true for many of them. I think it's cluelessness: Either they haven't made the connection between loving animals and not eating them, or they have and they're in denial because they're just too conditioned to think of chickens as anything but food, and why should they care how they get their food? Or maybe they think that eating free range whatever is as far as they need to go and see veg*anism as unnecessary, possibly even unhealthy, if they've been brainwashed to think of veg*anism as unhealthy. Yes, there are people like that. I remember once at work we hired a woman to help me out in the office, and when I mentioned I was a vegetarian, her reaction was to enthusiastically inform me that she makes sure her family eats only organic, free range meat and eggs. Not sheepishly, like she knows it's not enough and they really want to do better by cutting out meat and eggs entirely, but happily, like they're doing their part for animal welfare by not eating factory farmed animals, and I should applaud them for that. I don't remember what I said in response, probably something like "Uhhhhhh...I gotta get back to work."