Congrats on finding a Boston! We adore ours. She was a rescue, a year old when we got her. She sleeps under the covers like everyone elses! I had no idea that was a breed trait! LOL! We never thought we'd have a Boston. We aren't "little dog" people, but they really don't give you a chance to not fall in love with them.
Mine chased (and caught) a chicken the first week I had her. I chased her down (chicken was unhurt) and yelled at her and shook her collar. It broke her heart. She has never ever chased another chicken again. I have left her in the yard to guard the chickens when they were younger, and she would protect them from hawks, snakes, and my overly curious cat. She does the morning patrol with me to check on every one, and has broken out of the house and over the fence to chase off dogs that have come on to the property to have a nice chicken meal.
The worst thing about Bostons, that I have found, is that a fence will not keep them in. However, they will rarely leave unless they aren't fixed, or someone/thing they love is in danger. Of course, if you leave them outside 24/7 they will find their own fun.
Ours is a house dog, but has a dog door. She doesn't leave, even though she can, unless something is wrong. We have a 4 foot chainlink that is a joke to our 13 pound female. You need a 6 foot wooden privacy, at a minimum, if you want to leave them outside and not have to worry. All that being said, they are easily trainable and very much a people-pleaser. Have clear-cut rules of acceptable behavior, and they will be a wonderful dog!
Shelly