Everything New Pet Owners Get Wrong About Animal Body Language

Research in animal behavior shows that the direction and position of a wag carry distinct meanings. A tail held high and wagging in short, stiff arcs often signals alertness or tension, while a loose, low wag at a wide sweep tends to suggest relaxed friendliness. A 2007 study published in Current Biology also found that dogs wag more to the right when approaching familiar people and more to the left when encountering something threatening. Approaching any dog based on tail movement alone — without reading ears, posture, and mouth — is a common mistake that can lead to bites.

Purring is a self-soothing mechanism cats use from kittenhood. While it absolutely can signal pleasure, veterinarians and animal behaviorists note that cats frequently purr when they are stressed, injured, or unwell. Context is everything: a cat purring while curled up on your lap after play is likely content. A cat purring in a carrier at the vet, crouching low with flattened ears, is almost certainly frightened. Always pair the sound with a full read of posture, ear position, and eye shape before concluding your cat is at ease. For more on interpreting feline signals, see Cat Behavior Decoded.

Dogs roll onto their backs for two distinct reasons: relaxed invitation to play or be petted, and submissive deference when they feel threatened or overwhelmed. The distinction lies in the rest of the body. A relaxed invitation typically comes with a loose, wiggly posture, soft eyes, and a gently wagging tail. Submissive belly exposure, by contrast, often includes a tucked tail, averted gaze, flattened ears, and sometimes a small amount of urine. Reaching in to pet a dog displaying the latter can increase its anxiety rather than calm it down.

In feline social dynamics, prolonged direct staring is a challenge or threat. A cat that looks away or slow-blinks in your direction is actually communicating comfort and trust. Ethologist and cat behavior expert literature consistently notes that slow blinking — sometimes called a "cat kiss" — is a signal cats use both with each other and with trusted humans. You can try slow-blinking back at your cat; many cats will respond in kind. Forcing eye contact or hovering close to a cat's face, on the other hand, can read as intimidating and cause the animal to withdraw.

Growling is part of a dog's natural warning ladder, which progresses from subtle signals like lip licking and yawning through to growling, snapping, and biting. When owners punish growling, dogs often learn to skip that warning stage entirely, making bites more likely and more sudden. Applied animal behaviorists recommend treating a growl as information: something is making the dog uncomfortable, and that trigger needs to be identified and addressed — ideally with guidance from a certified professional trainer or veterinary behaviorist. Understanding canine communication patterns starts with respecting the signals dogs already give.