I have a 6 pounder, a 7 pounder and a 2 pounder. Altho I love them all and they look so cute together, the 2 pounder (Starr) runs fast and can get into trouble faster then the others. She is more timid in emergencies and runs away from them rather then to me which can be extremely dangerous. If a vulture or owl or any animal which normally eat rabbit for example, my Lil Starr would be in for trouble so when she goes out I need to be right next to her or else she needs to learn to not mind a leash at all times which means any exercise for her to run wild is indoors only, UNLESS we have a number of adult humans standing around the yard to help out in an emergency. Chloe & Sissy can have more freedom, altho I worry about them too, it's just not as dangerous. I find the smaller they are, the more inquisitive but that might just be my girls personalities. My Lil one is the only one of the 3 that gets into trouble continuously, cords, small tight corners and chewing whatsever in it OR at least trying. I am always on top of her but because of her size I need to be. And that's without saying no gate can keep her in-she can squeeze into any crack inside or out and climbs like a monkey. I love her but it is harder then having a larger Yorkie