After the recent deaths of over 100 dogs, please be aware that you should never force your pet to eat if he suddenly finds his favorite meal unsavory. Animals have natural instincts that tell them something isn't quite right.
Unfortunately, many people who love their pets just assume the animal is being fussy and have added gravy or something tasty to lure the animal back to the food bowl. Not eating might be an indication that an animal isn't well, but it also might be because the food is toxic. This has also affected some cats.
By the way, this isn't one of those silly internet rumors. Here is an article posted by Cornell University.