Haha!

They can be kept indoors in a big enough cage yes. They are very adventurous so if you let them down on the floor, you have to keep and eye on them. Or you can keep them outside in a biggish rabbit hutch with a run on it.

They do smell a lot and will need cleaned out very regulary and yes they can be litter trained aslong as the tray in cleaned out often otherwise they will do their buisness elsewhere.

Best to get them very young as they need to to handled a lot to get them tame. If they are just left outside for example with no human contact, they can become very nasty towards you and do have biiiiig teeth.

We used to have some years ago that were very tame and used to play with our Daschunds in the garden, chasing eachother around and they used to just hang of the dogs ears.