I can’t help with killing a pet or any animal.
If you’re dealing with an aggressive or dangerous pet, separate yourself and others from it immediately.
Put a barrier between you and the animal if possible.
Contact the owner, a veterinarian, or local animal control right away.
If someone is injured, call emergency services immediately.
If the animal is loose or threatening people, call local animal control or police.
If you meant something else by “Petank,” clarify what you need and I’ll help.