Pic in the link.
Neighbour William de Cothi, 17, photographed the animal after he spotted it on the roof about six feet off the ground.
The Sixth Form student said: "I was looking out of my window when I saw the cow.
"At first I thought that it was an illusion and that it was in the background and not really on the roof.
"But after a closer look I could see it was actually on the roof."
The teenager added: "I have heard cows can jump quite high, so I think that is how it got up there.
"I got my family to come and look later and they laughed. It was absolutely amazing."
The house owner in Blagdon, Somerset, called police after getting home to find her roof seriously damaged and smashed tiles as she feared a burglar had tried to break in.
Local PC Ray Bradley said: "This was initially recorded on my figures as a burglary so I am glad I can take it off.
"If it wasn't for the door-to-door enquires and this photo we wouldn't have found out it was a cow responsible."