Having a pet is one of the most rewarding things in the world. The unburdened joy of your dog when you return home from work and take it for a walk. The quiet purr of the cat huddled in your lap after a stressful day. The calming movement of the fish in the aquarium. The philosophical look of the iguana and the turtle suggesting that worrying about insignificant things is pointless. The charming song of canaries.