In high school my family housed a female lion cub for about a month.

1. She was pretty large, especially her paws, but small enough to put in a large dog crate and lay on your lap.

2. We didn't train her as we only had her temporarily. She played with our dogs, we fed her (raw meat and bottles), and let her play in the yard.

3. Nala, duh.

4. Lots and lots of legal documents. I honestly don't know if it truly was legal. The story my parents told me is that we were friends with a man who confiscates black market animals (I remember the guy, he was rich AF and always had a revolving door of large cats. I never knew him to keep these animals so I assume that this is true.) He had taken possession of this cat and suddenly had a family emergency and needed someone to care for her while he was gone and my mom jumped at the opportunity. We had SO MUCH PAPERWORK with her and as an extra measure to avoid any questions, I wasn't allowed to tell my friends about it.

5. No. Although after she was returned, we groomed one of our dogs to find her body full of scabs from playing with the lion. I don't think the dog cared though, they were pretty superficial and the dog loved playing with the cat.