Pets won't follow/Animals can't be fed

I logged into my minecraft world and all of my dogs stopped responding to me. They won't sit, won't follow, nor will they eat. None of the other animals (cows, sheep, pigs) will eat either. While holding the food, the animal will look at you as if it's interested but it will not take the food, no hearts appear or the eating sounds don't go off as if I didn't try to feed the animal.