Understanding canine body language is essential for recognizing how dogs feel. Stress signals include yawning out of context, lip licking, panting, ears pulled back, and a tucked tail. "Whale eye," the appearance of the whites of a dog's eyes, often indicates discomfort. Dogs also display appeasement behaviors, such as lowering their body or averting their gaze, to signal peaceful intent. These signals are not weakness; they are communication. When a dog is pushed past these warnings, escalation to growling, snapping, or biting becomes more likely.
Dogs communicate through their entire body. A play bow, with the front legs down and rear up, is a clear invitation to play. A wagging tail does not always mean a happy dog; the meaning depends on speed, position, and accompanying body language. A relaxed body, soft eyes, a wagging tail held in a neutral position, and play bows are signs of a happy, content dog. By contrast, signs of pain can include limping, decreased activity, changes in eating, restlessness, panting, hiding, and even aggression when touched. The so-called "guilty look" that owners often interpret as remorse is actually appeasement behavior, not true guilt.
Dogs generally respond to stressful situations with one of the four F responses: Fight, Flight, Freeze, or Fidget, sometimes accompanied by appeasement. They may also be reactive, overreacting to specific triggers like other dogs or strangers. Scientific research into canine cognition has shown that most dogs can learn more than 100 words and that some breeds excel at problem-solving. Dogs experience basic emotions like joy, fear, anger, and anxiety, though whether they experience jealousy remains debated. Their theory of mind is limited but present; they can read human emotional cues remarkably well. Recognizing the difference between play and aggression is also important: play is bouncy with alternating roles, while fighting is stiff, intense, and one-sided.