Yeah, I have noticed that...

I look at it this way. Every dog that sees me, even from far away starts to flip out, bark, chase, ect.

Its like in terminator two, how the dogs can smell the cyborgs.

Out there touring, in harmony with the machine, we are cyborgs, and the dogs know it.

The cows do too, but unlike their canine bretheren they owe no allegiance to mankind. They sit there placidly waiting for us to destroy ourselves and stop eating them.