The smallest dish opening is about 5 1/2 inches and the three larger ones are about 9 inches (inside measurement) across. I'm asking $4.00 for each of the larger dishes and $3.00 for the small one. We keep one dish at our front door (nice to have a drink when you get home) and one at the back door. Our dog seems to like the cold water outside, rather than the water inside. They are in new condition. We are in South Oak Bay if you would like to see them. The funds will be donated to Our Place to help our homeless.