Ok YLL, I will get this thread moving.
I will answer question #4)
I do believe the American Quarter Horse is the world's most popular breed(one of your favorite breeds and mine too)
If that isn't the answer you are looking for then I would say the Arabian because that is the world's oldest breed.

Check out this link I found, I got all 10 right!
http://www.riovistaproducts.com/breeds/quiz.html
See if you can name all 10 breeds!