There are a few things to consider when serving liver to dogs. The first is that liver is very high in Vitamin A, so it should be given in moderation. Too much Vitamin A can be toxic to dogs. The second is that liver can be a bit tough for dogs to digest, so it's important to cook it well. Finally, some dogs simply don't like the taste of liver, so it's important to offer a small amount at first to see if your dog will eat it. If you decide to feed your dog liver, the best way to cook it is to simmer it in water until it is very soft. You can then add it to your dog's food or feed it as a treat. Start with a small amount and increase the amount gradually over time. If your dog doesn't seem to like liver, you can try mixing it with other foods or treats that he or she enjoys.