I "petsat" for a neighbor once and the dog was so tiny and I was a bit nervous to let him run around The House because I was afraid he would crawl under something and get stuck or easily get hurt if I wasn't eyeballing him every second. I mean this dog was maybe 5 or 10 pounds full grown the size of a few week old puppy. But was thinking how much easier he would be to deal with in terms of traveling. My dogs (who are only about 50 pounds each) can be a bit of a hassle when it comes having to go out of town, and with a small dog like that they would be so much easier to just take with you. Which size dog do you prefer? Small, medium or large?