Why Do Dogs Have Dewclaws?
QUICK ANSWER
Dewclaws are the small, thumb-like toes on the inside of a dog's leg, just above the paw. They're an evolutionary leftover from a time when dogs' ancestors needed them for gripping terrain. Most dogs still use their front dewclaws to some degree, while rear dewclaws are less functional and more breed-specific.
That little extra toe on the inside of your dog's leg that seems to serve no purpose? It actually has a history, and depending on the dog, it might be more useful than you think. Dewclaws are one of those features that people either never notice or obsess over removing. Here's what you should know.
What are dewclaws for?
Dewclaws are the remnants of a fifth toe that dogs' ancestors used for gripping. If you watch a dog holding a bone or a chew toy, you'll often see them use their front dewclaws to grip and stabilize the object. Dogs also engage their dewclaws during running, particularly when making sharp turns at high speed; the dewclaw contacts the ground briefly to provide extra traction and prevent the leg from twisting. For active, athletic dogs, front dewclaws are genuinely functional, not just a leftover.
What about rear dewclaws?
Rear dewclaws are less common and often less functional. Some breeds, like Great Pyrenees, Briards, and Beaucerons, have double rear dewclaws as a breed standard, and in some working contexts they provide stability on rough terrain. In other dogs, rear dewclaws may be loosely attached with little bone structure, making them more prone to snagging and injury. Whether rear dewclaws are useful or just hanging around depends heavily on the breed and how well they're attached.
Should dewclaws be removed?
This is a debated topic. The American Veterinary Medical Association doesn't recommend routine dewclaw removal unless there's a medical reason. Front dewclaws are functional and removing them eliminates a useful tool for your dog. Rear dewclaws that are loosely attached and prone to tearing may be candidates for removal, especially in dogs that are very active in rough terrain or dense brush. If a dewclaw gets injured or torn, your vet will address it on a case-by-case basis. Blanket removal "just in case" isn't considered best practice anymore.
Why do they dock some dogs' tails?
Tail docking is related but separate from dewclaw removal. Historically, tails were docked in working dogs to prevent injury during herding, hunting, or guarding. Some breeds were also docked for aesthetic reasons set by breed standards. Today, the practice is increasingly controversial and is banned in many countries. The American Veterinary Medical Association opposes cosmetic tail docking when done solely for appearance. If you're considering any elective procedure, talk to your vet about whether there's a functional reason for it in your specific dog's case.
Dewclaws are a small but interesting piece of canine anatomy. Front dewclaws are functional for most dogs and generally shouldn't be removed without reason. Rear dewclaws are more of a case-by-case situation. And if you're wondering about tail docking, the veterinary community has largely moved toward leaving things as nature intended unless there's a clear medical need. When in doubt, ask your vet.
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