The rabies virus would need to be engineered to attack just the movement and higher intelligence parts of the brain. It would need to be as adaptable as Aids so a cure cant be found while at the same time being weak enough not to kill the host.
The virus would need to attack the starvation mechanisms in the brain making someone so desperate for food they'd eat human meat while putting them off vegtables etc.
I think its within the realms of possibility but maybe 20 years away.
Contrary to myth and Stephen King novels about killer dogs, reality does not work that way. Rapies does not cause people or animals to go on a murdering rampage, biting everything in their way! House wifes during a sale at bloomingdales is another matter though!