Some Dogs, famished with hunger, saw some cow-hides steeping in a river. Not being able to reach them, they agreed to drink up the river; but it fell out that they burst themselves with drinking long before they reached the hides.
Moral of Aesops Fable: Attempt not impossibilities.
The Dogs and the Hides Fable
An Aesop's Fable
With the Moral: Attempt not impossibilities.