A gravity feeder works the way it sounds—with gravity! As food or water in the bowl runs low, the reserves get triggered to release more. Easy-peasy.
An extra-wide mouth not only makes food and water bottles easy to fill, but it also makes them much easier to hand-wash. Some models are dishwasher-safe, but read the instructions before using a machine.
The upside to transparent bottles is that they allow you to eyeball food and water levels, so you’ll always know when to refill. And even if you have a more minimalist design sensibility, the convenience of the function outweighs the form.
Because gravity feeders release kibble into the bowl when it’s running low, they’re best for pets who stop eating when they’re full. If your four-legged friend tends to binge with unrestricted access to food, look to a small-capacity feeder.