Co2 Refill for the Pet Convincer The Pet Convincer is a safe, humane and effective tool aimed at instant results for curbing excessive barking, jumping, stealing, digging, disobedience and even aggression. The Pet Convincer was intensively tested and received the seal of approval from leading trainers, veterinarians and pet care professionals for its safety and effectiveness. The Pet Convincer is based on the Pavlov animal behavior concept that incorporates a unique mixture of acoustic effect and convincing air.