Look at these two characters, especially the little one which has attitude. I generally wouldn't recommend getting this close to cows. In my case, it was about 7:30 AM and I was returning to my car after doing some photography at Garrapata Beach and there was a gate to presumably ranch land with some cows in the distance. I generally ignored it and started packing away my gear, but then a few of them started approaching the gate. Not to waste an opportunity I quickly attached the widest lens I had with me, crossed the road, held the camera as low I could with the lens sticking through a space in the gate and fired off a few shots. The cows were backlit so I knew I'd end up blowing out the sky but it wouldn't matter. I experimented a bit, I had initially wanted the sun in the frame with a sunburst but any images with the sun the frame had so much flare it was a total loss. This is what ended up working out and even though there is still some flare, it isn't that bad.
#1 - 5D3, 17 TS-E, f/13, 1/40s, ISO 100