You wanna eat McDonald’s, eat McDonald’s.
OK.
Looks like I DO need to elaborate. We humans are just about the ultimate omnivore on the planet. Pigs may have us beat, but only by a little. There are a whole lot of things that we humans can eat, that are unfit for other species like dogs. Chocolate is only one such example.
McDonalds is gross. The facts that (1) their new hamburger contains onions and (2) that onions can be harmful to dogs have no bearing on the fitness of their hamburgers for human consumption.
Your original post contained the “hidden premise” fallacy. The hidden premise in this case was that human and canine dietary restrictions are the same. That premise is false.