She was not a "federal officer" She was a park ranger who found a guy with his two dogs off-leash and made it a major crime. She is an idiot.
If you can't see the overkill because of a leash offense then I can't help you.
What do you think a NPS ranger is? And she didn’t zap the guy because his dogs were off-leash, she did it because she suspected he gave false information and tried to leave.