Shiba Inu Tail Types: Curled, Straight, and Sickle (With Pictures)

The Shiba Inu is famous for its expressive tail, but not every Shiba carries the same curl. The breed is generally divided into three tail types: curled (the iconic ring tail resting on the back), sickle (a raised curve that does not touch the back), and straight (a natural hanging tail). Of these, the tightly curled tail is the classic look, the sickle is accepted but less desired, and the straight tail is considered a serious deviation from the Japanese NIPPO and AKC breed standards.

The Curled Tail (Maki-O)

The curled tail, called maki-o (巻き尾) in Japanese, is the signature Shiba Inu tail. It curls up and over the back, with the tip ideally pointing back toward the body. Within this type, breeders distinguish between:

• Single curl – one full loop resting on the loin.
• Double curl – two full loops, considered highly desirable in the show ring.
• Loose curl – a soft, open curl that still touches the back.

NIPPO judges prefer a thick, strong, high-set tail with a tight curl and a flexible tip. A double curl is often called the "ideal" Shiba tail and is more common in males than in females.

The Sickle Tail (Sasumata-O)

The sickle tail, or sasumata-o (刺又尾), curves upward in a crescent or scythe shape but does not touch the back. It can be carried high above the spine or held at a gentler angle. In Japan, this tail is acceptable in show but is ranked below the curled tail. Sickle tails appear more often in certain bloodlines, particularly those tracing back to the San'in Shiba of the 1930s.

The Straight Tail (Nobi-O)

A straight tail, nobi-o (伸び尾), hangs downward in a natural position similar to a wolf or most other spitz breeds. It is the rarest of the three Shiba tail types and is considered a disqualifying fault under both the NIPPO and AKC breed standards. From a genetic standpoint, the straight tail indicates the absence of the T-box gene mutation that produces the curled tail, so this type is recessive in Shiba Inu breeding.

Do Tail Types Change With Age, Mood, or Breeding?

Tail position can shift in everyday life without indicating a different type:

• A relaxed Shiba may let a curled tail drop into a sickle or even a loose curve.
• An alert or confident Shiba will tighten the curl, sometimes revealing a second loop.
• Puppies are often born with straight tails; the true curl develops between 3 and 6 weeks.
• A nobi (straight) puppy from two curled-tail parents can still appear, since the straight-tail gene is recessive.

Because tail type is genetic, it does not "improve" with age, training, or grooming. A Shiba born with a sickle tail will always have a sickle tail.

Why Tail Type Matters in the Breed Standard

The NIPPO standard of 1934, which became the foundation of every modern Shiba Inu standard, lists the tail as one of the most defining breed features. It must be thick, strong, and set high. Judges in Japan are notoriously strict: a beautiful dog with a poor tail will lose to a more average dog with an excellent double-curl tail. In the AKC ring, the same logic applies, though the standard allows any curled or sickle tail that is set on high and reaches the hock when let down.

For pet owners, tail type rarely matters beyond aesthetics. Health and temperament are far more important than whether a Shiba carries a single or double curl. If you are buying a show-potential puppy, however, ask the breeder directly about the tail genetics of the parents and request photos of the tail at 6-8 weeks, when curl quality is easiest to evaluate.

Quick Summary

• Curled (maki-o): breed standard, single or double loop over the back.
• Sickle (sasumata-o): accepted, curved upward but not touching the back.
• Straight (nobi-o): disqualifying fault, hangs down, recessive trait.

No matter which type your Shiba carries, that tail will be one of the most expressive parts of the dog, used to communicate everything from pure joy during a "Shiba 500" to the famous Shiba scream.