Oh and those dog things? In the universe, it's explained that the makers of the Hunger Games can spawn enemies and change the weather at will to mess with the tributes, basically making it Survivor: Playing God Edition. In the film, it's implied that these "mutts" are just some weird-ass hybrid animals. But in the book, it's explicitly stated that these are actually the dead tributes who have been turned into these creatures, their DNA spliced with that of dogs. (Katniss recognizes one when she looks into its eyes. Plus they have collars with the tribute's District numbers on them, if the symbolism wasn't clear enough.)
So if you were watching this wondering "Wait, what do they do with all the dead kids? Is there, like, a pile?" Oh, it's just that they perform brutal, Nazi-like mad science experiments on them and then send them out to the arena to eat all of their former friends. Christ, author Suzanne Collins. I can see why the films cut it. Hard to get 12-year-olds emotionally involved in a story about re-animated dog-child cannibalism in any way that doesn't involve one long shriek.