Tim Burton had this to say to EW:
It just tries to keep that idea of a very, simple pure relationship. Mix that with the Frankenstein myth, and it causes problems.” But the big beating heart in the story (apart from the re-animated one inside Frankenweenie’s chest) is the sad fact that we all outlive those four-legged pals from our childhood, and goodbye can be a painful thing. The idea of bringing a lost friend back to life? “It has its good side and repercussions. Ultimately, we try to go with the slightly more positive aspects of keeping that [boy-and-his-dog] relationship going.