Why is my dog not eating?

-she won't eat anything! anything but home cook meals primarily pork or beef. I'm tired of her not eating her DOG FOOD! I hate meat, I only eat fish! my parents are meat lovers though, and sometimes feel very bad for the dog and end up feeding her some fresh out of the oven meat! that's non sense! lol I am sick of that dog thinking she's so worthy of "freshly ****** meat" I have 6 cats, and they eat just about anything..and are very well behaved unliked that dog.