Idea of Livestock Icon
The image is a square with slightly rounded corners. One of the corners is pointed straight up. Inside the square is the head of an animal that appears to be a cow. The animal doesn't have a mouth or eyes the but nose is pointed to the right.
This page shows the different variations of the Livestock from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.