hi there,
i just saw the message you posted on my profile but will respond here, too.
yes, i have the large alexa. i LOVE the alexa. that said, my personal opinion is that it would be great for a larger yorkie, or two little ones, but is too roomy for just one smaller dog. lulu is close to 5 lbs and she seems to get a bit lost in there.
from the description of you and your guy, i would definitely go with the smaller size. just my humble opinion!