The short answer is "yes". However, many precautions are needed first. The general rule is that if a ferret can fit his head in an opening the rest of the body can follow. All holes, cracks, vents,...
No it is not illegal to walk around your house with your underwear, it is your house you walk around your house how ever you want to. However, if you pass open windows and doors, it could be an issue...
Before bringing your rabbit outside on a leash, it's a good idea to walk her around inside so that she gets used to the harness and leash without a lot of new stimuli around. Otherwise, it's not a...