After having reviewed the script, I see no evidence that Lucy gave the drug sniffer dog anything other than a mild electrical stimulus (a jolt) in order to scare it away.
A sniffer dog ambles over.
DEL RIO: Okay... What form are the drugs in? Bars? Capsules?
LUCY: Powder. In plastic packets hidden in their intestines. Make sure they don't split open when you take them out.
DEL RIO: Pardon me?
Lucy lowers her dark glasses.
The dog recoils, its tail between its legs. Lucy nudges her glasses back up her nose.
A few minutes later, we see her do very much the same to the flight attendant who tells her to put her computer away:
FLIGHT ATTENDANT: Miss, I have to ask you to put away your computers now.
Lucy is engrossed in the thousands of items of coded information
scrolling past her eyes. It's illegible for any normal human being.
FLIGHT ATTENDANT: Miss?
LUCY: (riveted to the screen) You should wipe your nose.
The Flight Attendant doesn't understand.
A drop of blood appears in one nostril. The woman touches her nose and
realizes she's bleeding. Slightly flustered, she scurries away. Lucy