Dog bowls come in a variety to accommodate the size of the dogs and their eating habits. For example, a Great Dane would benefit from having a dog bowl that sits on a stand at a height that is comfortable for them. A tiny puppy would need a shallow bowl so they can get to the food easily.
Some dogs eat fast, as if they don't even chew. There are dog bowls designed to slow down their eating. This can help with digestion and bloating.