In the older days, the family dog was more common and essential. In survival, SHTF, a dog can again be an extra valuable companion. So, the let the debate begin on best dog for SHTF.... Bigger dog is better if he were to engage in a fight. Bigger dog also requires more food, which won't be as easy as a trip to the pet section anymore. Little dog can still be a deterrent and an alarm and doesn't eat as much. OK, what's the best SHTF dog.