how do you train a dog not to like a specific person?

Show him pictures of Liberals

If you do that, and the dog hurts that person, the authorities can put your dog to sleep and you can get a big fine.

give his photo and tell it to shout,bark and bite at it.ha ha ha................................................ .................................

'Sik em boy !!' A good piece of porterhouse steak will provide all the motivation your dog is ever going to need.

What kind of a question is that? Are you sure you should own a dog?