Although your Welsh corgi is primarily an omnivore who can eat almost anything, there are some foods that should never be eaten because they can make your corgi sick or even kill him. No matter how much your dog begs for these forbidden foods, do not give in.
Never feed your corgi chocolate because it can be deadly. Other foods to particularly avoid include onions, spicy foods, poultry skin (chicken, turkey, etc.), poultry meat with bones in it, and most diary products (milk, cheese, etc.). While these foods may not kill your dog, they have the potential to make him very sick.
And of course there is the problem of Welsh corgis tending to gain weight. Giving your corgi meal leftovers can lead him to begging to get more. This is a bad habit/trick to teach your corgi. Every time you feed leftovers, it makes it difficult to stop your corgi from begging for more in the future because you’ve tied together the concept of begging and getting fed in response. So do not start giving your leftovers from your meals or you may have to spend a lot of time teaching your corgi not to beg plus have to put him on a diet to lose all the weight gained from overeating the wrong types of food.