A panther is traditionally a way that ignorant people have referred to black leopards, black jaguars are of the Panthera genus.
Panthera is a genus consisting of:
- Panthera leo - lion
- Panthera tigris - tiger
- Panthera onca - jaguar
- Panthera pardus - leopard
- Panthera uncia - snow leopard
A big cat is a somewhat flexible group, with different people/organizations including or excluding cheetahs and pumas.
All of which are wild animals. And they cannot be domesticated. Tamed, maybe.
Taming is when you train an individual of a wild species to act well around you. Domestication is a species that's been bred to work well with humans.
A tamed animal will always be more wild and unpredictable than a typical domestic animal, and therefore dangerous, if the animal caretaker doesn't know what they're doing.