Here's a link to an article on modern mega dairies, Ebbie - http://www.bbc.co.uk/news/science-environment-11610359. If it doesn't work in your location, just web-search "mega dairies milking three times per day" or similar.

And I don't have a dog, but quite like Jack Russels.

Spaw - If you do chew, try swapping gum for a bit, for a bit!