Do you have any pictures, thank you.Elevate it. So that the rim is 3-4" from the ground. (Never saw a reason to do so myself)
Put a cover with a head-sized opening on it ( I do that in winter, so that the 3W heating element keeps it from freezing)
Or use shallow bowls where they can get out.
Never had a problem, when they were big enough to get into the bowl, they also managed to get out of it.
In winter, I might resort to elevating the bowl.