I have no water

A few days ago our water stopped working. Its a private well. There is a pump out a ways across the pasture. It connects to an outside shed where the water filter is and then it goes to our house. I think the problem might be at the pump. Its turned off once before. When it happened the first time, we walked out to the pump and saw where the cows had broken the plastic casing that covers the electric wires for it. We moved it around a bit, decided we had no clue how it works, and put the cover back on it. When we back inside our water was working again. Any ideas?