I would find it hard to imagine that given the nature of dogs and to a (MUCH, MUCH!) lesser extent, cats, to show affection to the Alpha, that eventually said Alpha would put their hand down and give Fido a scratch of the ear, which in turn would lead to Fido completely falling over and wagging his tale like mad at this act of affection. This would lead to things such as playing a game called "ball" and other such activities and would begin the man's best friend bonding process.