Which feature, besides the topknot, contributes to the breed's signature rugged look?
Answer
A distinct ruff around the neck extending toward the breastbone
The characteristic look is completed by the distinct ruff around the neck which extends forward toward the breastbone.

Related Questions
What is the primary structure of the Australian Terrier's coat?How is the functional, weatherproof outer coat of the body described?What primary function does the short and soft undercoat serve?What feature on the head contributes to the breed's signature look?Why is hand-stripping recommended over clipping for the body coat?What characteristic of the Australian Terrier coat often leads to the 'hair' designation instead of 'fur'?What approximate length should the top coat on the body be kept?Which feature, besides the topknot, contributes to the breed's signature rugged look?Which colors are accepted for the Australian Terrier coat?When is it often advised to schedule major hand-stripping procedures?How does the texture of the Australian Terrier's outer coat compare to that of the Australian Silky Terrier?What is the recommended frequency for bathing this breed, unless they become very messy?