Remember that time when one dog in ny got rabies, then 3 weeks later ALL the dogs from ny to la had rabies? Yeah...me either.
Until that gets explained in the first 20 mins of a zombie epic, I'm done with the genre.
If you have Netflix, check out jeremiah. Awesome apocalypse scenario. Well done. Better than this **** gore.
Hmm, isn´t that a bit like saying "Until someone explains to me how all the people on earth started living in peace, I´m done with Star Trek"? Were you happy with the "scientific" explanation for the force in Star Wars Episode I? Personally, I liked it better when it was still a mystery.
Judging by the comics, there´s a reason why they didn´t explain the exact circumstances for the outbreak, yet. I think that´s just the part of the zombie genre where the audience has to suspend their disbelief.
If I had to make an attempt to explain the major differences between a rabies and a zombie outbreak, I´d say that a) there are more humans than dogs, b) rabies doesn´t necessarily drive every dog to bite other dogs, and c) humans don´t care for dogs as much as they do for other humans.
If you´d see a rabid dog on the street, the most likely reaction would be to call the cops, who will easily take care of the dog. If you see an old woman wandering aimlessly through the streets, you probably walk up to her to see if she´s ok, at which point it´s already too late.
Also, the fact that a rabid dog is no threat if you shoot him in the leg, while a zombie needs a shot in the head, is a pretty significant difference. I´d suggest to read "World War Z" by Max Brooks, son of Mel Brooks, where he tries to come up with relatively logical explanations for exactly these kind of questions.