Just because their teeth are designed to eat meat, doesn't mean they NEED meat to be healthy, doesn't mean there's not something else that could replace that and sustain their health just as effectively. All it means is they evolved to eat meat bececause that's what was around them as a food source at the time, that's what was available and the best way for them to survive at the time and in those circumstances.
The differences are not superficial. A carnivores gut is designed to process meat. It can not process other material as easily. A dog can not gain the same nutrition from vegetables as humans.
Humans would have a pretty horrible time surviving if we tried to eat large amounts of grass likes cows. Its a similar (yet admittedly more extreme) comparison. Even then we would be better off eating grass compared to dogs.
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