For Lack of appetite due to fast-eating, this’s simple as they will start eating again after skipping a meal or two.
ForGastrointestinal upset, justlook for signs that he has some diarrhea or if vomited somewhere. As long as there is no blood in the stool or vomit, you should allow them to expel the offending matter from their systems, taking into consideration not to become dehydrated. If the vomiting or diarrhea lasts more than 24 hours, a vet trip is a must.
For Dogs liking routine Just make any changes gradually and make sure that your dog feels secure and included in what’s happening in your home. remember it is temporary till they feel secure again
For Behavior problems, if you have multiple dogs feed them separately, so they can eat in peace and take their time related to their feeding pace and they will often start eating again when left alone with their food.
For Age-related issues your dog will be able to eat again after a vet’s visit to examine his teeth if he suffers from dental issues, also warming a senior dog’s food or adding some stew and tasty toppings will make it smell and taste more appealing to him.
For Picky Eaters Just find good food that your dog does well on and stick with it. Remember dogs will eat when feeling hungry, and they really don’t like changes, so keep their meals on a regular time and monitor how much you feed, and they eat, also keeping treats in a reasonable amount, will stop them from being picky eaters. One more, dogs aren't born picky eaters, owners make them that way.
