{"id":13643,"date":"2024-06-10T06:17:52","date_gmt":"2024-06-10T13:17:52","guid":{"rendered":"https:\/\/osfbl01.justfoodfordogs.com\/?p=13643"},"modified":"2026-04-21T10:08:55","modified_gmt":"2026-04-21T17:08:55","slug":"why-do-dogs-have-tails","status":"publish","type":"post","link":"https:\/\/justfoodfordogs.com\/blog\/why-do-dogs-have-tails","title":{"rendered":"Why Do Dogs Have Tails?"},"content":{"rendered":"\t\t
\n\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\n

Most loving pet parents can tell you a lot about their pooch by the movements of his tail. It\u2019s an important part of his personality, and it plays an important role in a dog\u2019s body language<\/a>. It\u2019s part of at least what you think you know about the emotional state of your dog.<\/p>\n\n

But is it really? Why exactly do dogs have tails in the first place, and what do they use them for? Let\u2019s explore what scientists know about the evolution and function of tails and how domestication may have affected this much beloved physical trait.<\/p>\n\n

Why Do Any Animals Have Tails?<\/h2>\n\n
\"dogs<\/figure>\n\n

Tails are a characteristic of animals in the phylum Chordata<\/a>, also known as vertebrates, meaning animals with backbones. One of the defining characteristics of animals in this category is the presence of a flexible tail that supports their back sides.<\/p>\n\n

There are some other types of animals that have tails, but the majority are in this category. Moreover, the tails present on animals are diverse in function and shape. There are long tails, short tails, curly tails<\/a>, straight tails, and even stumpy tails.<\/p>\n\n

Many animals use their tail like a fifth limb for propulsion, stability, and enhanced maneuverability. It is used by some animals to warn other animals they\u2019re crossing a line, or to let potential mates know of their desire to get a little closer.<\/p>\n\n

There are also some animals that can use their tails to help regulate their body temperature (they wrap their tail around them to keep warm, though, for some dogs<\/a>, this isn\u2019t enough), store energy, and grab ahold of branches as they swing through the trees. In essence, for some animals, the tail is critical for their survival. But what about dogs? Why do dogs have tails?<\/strong><\/p>\n\n

Why Do Dogs Have Tails?<\/h2>\n\n
\"why<\/figure>\n\n

Many experts have hypothesized on the reasons dogs have tails, but there is relatively little research conducted into this question. And more specifically, what effects domestication has had on the function of tail wagging.<\/p>\n\n

Dogs do not climb in the trees as many primate species do. Thus, it is not used as an extra appendage for navigating such a complex environment. So, what exactly is the role a dog\u2019s tail serves?<\/p>\n\n

To better understand why dogs have tails, it\u2019s important to consider ethologist Niko Tindbergen\u2019s four questions:<\/p>\n\n

    \n
  1. How did it evolve?<\/strong><\/li>\n\n
  2. How does it develop?<\/strong><\/li>\n\n
  3. How does it work?<\/strong><\/li>\n\n
  4. What is it for?<\/strong><\/li>\n<\/ol>\n\n

    Let\u2019s tackle these one at a time.<\/p>\n\n

    How Did the Dog\u2019s Tail Evolve?<\/h3>\n\n

    Dogs are part of the phylum Chordata. As such, their tail evolved long before their evolution into canids and their eventual domestication. Because canids, like dogs, don\u2019t use their tail primarily for locomotion<\/a> as other species do, like monkeys with prehensile tails. Their tail is used more for ritualized communication<\/a>.<\/p>\n\n

    Research suggests<\/a> that dogs were first domesticated more than 20,000 years ago. Archaeologists believe that a mutualistic relationship developed between wolves scavenging the remains of nomadic human camps and the human inhabitants of those camps, leading to domestication. The theory goes that the wolves benefitted from the food nomads inevitably discarded. In turn, humans benefitted from the wolves\u2019 presence because they warned of the approach of other predators and unfamiliar human groups.<\/p>\n\n

    The humans encouraged the wolves to follow the camp by giving them food. Eventually, they began to manipulate the reproduction of the canids. They did this to reduce the danger the animals posed to them. The resulting genetic changes led to smaller canids with friendlier temperaments and less dangerous physical characteristics (i.e., smaller canine teeth).<\/p>\n\n

    Over time, humans began to further manipulate the reproduction of their canine friends, which eventually produced the different breeds of dogs. Tail-wagging, then, became a communicative function to indicate the dog\u2019s internal emotional state. Something it would benefit the humans to know.<\/p>\n\n

    How Did Tail-Wagging Behavior Develop?<\/h3>\n\n
    \"how<\/figure>\n\n

    Canids of all kinds have tails, but there is a distinct difference between domesticated dog tail-wagging behaviors and the tail-wagging behaviors of other canids. While the use of the tail for communication varies greatly in different breeds of dogs, between the sexes, and in different individuals, domesticated dogs wag their tails much more than any other canid.<\/p>\n\n

    Between dogs and wolves, for example, the differences in tail-wagging emerge as early as three weeks of age. This is true even when the two are raised in the same way. Whereas the domesticated dogs began wagging their tail at this early age, wolf pups almost never did. That suggests the possibility that the domestication process<\/a> itself might have resulted in the favorable selection of tail-wagging in the context of interacting with humans.<\/p>\n\n

    That is in line with yet another study<\/a> that demonstrated adult beagles shifted from a left to a right-side bias as the dog became more familiar with the human experimenter conducting the test. Thus, it appears that the increased and side-biased tail-wagging behavior of dogs is the result of their interactions with humans.<\/p>\n\n

    How Does a Dog\u2019s Tail Work?<\/h3>\n\n

    As with other vertebrates, the dog\u2019s tail is an extension of his spine, but relatively little is known about how tail movements are actually controlled. Experts assume the cerebellum is involved in tail movement. When they electrically stimulate certain parts of the cerebellum, there is an increase in tail wagging.<\/p>\n\n

    Moreover, dog tail wagging is asymmetric. This means that a dog\u2019s tail will wag on one side or the other depending on what stimulates their behavior. Happy dogs show a right-side bias to their tail-wagging. In aggressive or frightening situations, such as meeting a dominant dog, they show a left-side bias to their wagging.<\/p>\n\n

    Research using robotic dogs shows that dogs are able to perceive the side bias to tail-wagging behavior in other dogs. This demonstrates the importance of the tail position in communicating various emotional states.<\/p>\n\n

    Other studies have also documented<\/a> a link between the time a dog spends wagging his tail and heart rate. Additionally, researchers argue<\/a> that the link between both positive and negative arousal states and tail-wagging behavior suggests that certain arousal-related hormones and neurotransmitters are correlated with how your dog wags his tail.<\/p>\n\n

    All of this suggests clear evidence of neurological control of the dog\u2019s tail, but exactly how everything works in conjunction with the behavior is still unclear.<\/p>\n\n

    What Is Dog Tail Wagging For?<\/h3>\n\n

    It appears that domesticated dog tail-wagging is mainly used for complex communication with humans and other domesticated dogs<\/a>. It\u2019s not just the tail wagging either; it\u2019s also the tail carriage or position that matters.<\/p>\n\n

    Additionally, the presence of the anal glands, which are used for scent communication such as territory marking. So what is your dog\u2019s tail movements trying to tell you? Here is what the research shows:<\/p>\n\n