This is not restricted to only dogs, research indicates that interacting with animals in general can reduce cortisol levels and elevate oxytocin, the happiness hormone. (ahealthblog.com)
There are many opportunities to interact with animals who someone to show them love. (animalbehaviorcollege.com)
It's important to get as complete a history as possible from the owner or shelter, and observe and interact with the animal before you bring it home. (petbehaviorproblems.com)