I dreamed of 7 fat cows coming from a full river and then the river dried and then 7 skinny came out from the dried river and ate the 7 fat cows.
The dream you had is similar to one of the stories in the Bible, which is about Joseph interpreting a dream for Pharaoh. In that story, the seven fat cows represent seven years of plenty, while the seven skinny cows represent seven years of famine that will follow.
In a general sense, dreaming of cows may represent fertility, abundance, and productivity. The fact that the cows are fat at first may suggest that there is an abundance of something in your life.
However, the river drying up and the cows becoming skinny in your dream may suggest that this abundance will not last forever. You may need to prepare for a time of scarcity or hardship, whether that be in your personal life, work, or relationships. The seven skinny cows devouring the seven fat cows may represent the difficult times or challenges that you will face.
Alternatively, the dream may also suggest that you need to be mindful of how you use your resources. It may be a sign to not take things for granted and to plan for the future.