I think that the average is 5 gal, not posotive though. It depends on the breed. For example a Holstein will more than almost every other breed, but a Jersy's milk is of a better quality. My grandparents own a dairy farm.
I would love to have the rat terrier. Alas I live in SD and would have to get my parents permission (impossible). I have a rat terrier and she is the best dog.
They are both very beautiful in coloring. #1 is more flashy- I like his coloring better. Personally for myself Iwould take #2 since you said that he seems gentler. You sound like you really like #1, so I say that you should get him. He looks like the nicer colt, I just have a sliht fear of...