Seems unlikely that livestock restrictions or import regulations would apply to slaves. They aren't legally people, but they would be legally human. Being human isn't as much a question for the law as wether or not a person is human. Sometimes the terms are used interchangeably, but legally it's personhood that matters.<br/><br/>Also, livestock restrictions are usually related to concerns about farms, and spreading disease between livestock populations, not something we deal with for humans, except in terms of what they bring in on their shoes.<br/><br/>As for what happens when a slave-owners goes, with their slave, to a non-slave country, that would be an international law question. The slave owner would be arrested, but not likely deported, as the moment they cross the border, they'd be committing a crime in the country they went to. Sort of like, if you transport a piud of marijuana from a country where it's legal, to a country where it isn't. They would arrest you, and charge you, and put you in jail. Offering the salve asylum also seems likely, as a refugee from humanitarian crimes.<br/><br/>Deportation is the penalty when the only crime is entering the country illegally. Having a slave in a country where that is illegal would be committing a crime in their jurisdiction.