The quality that makes a dog successful in the following paragraph is what?
The secret of a dog's success in handling a man is patience. Some men are a little slow to respond, but a dog who makes allowances and tries to put himself in the man's place will be rewarded with a loyal pal. My setter has broken me so thoroughly that I have decided to set down a few basic rules of manhandling, as a guide for other dogs who happen to own friends of mine.
slowness
intelligence
consistency
patience