The Dandie Dinmont Terrier is a small, long-bodied dog with a distinctive topknot of hair on its head. It has a unique 'scimitar' shaped tail, a soft, silky coat, and expressive eyes. Originally bred for hunting otters and badgers, it is courageous, independent, and affectionate.

The Dandie Dinmont Terrier is not a wild animal species but a domesticated dog breed originating from the border area between Scotland and England, specifically the Cheviot Hills region.

As a domesticated breed, the Dandie Dinmont Terrier does not have a natural habitat in the wild. It is typically found in domestic environments, including urban and rural homes. The environmental conditions suitable for this breed include moderate climates, as they have been historically bred and kept in the temperate region of the British Isles.

The ecological niche of the Dandie Dinmont Terrier is that of a companion animal and a working terrier. Historically, it was used to hunt small game such as otters and badgers, which means it adapted to various terrains including fields, woodlands, and farms. As a pet, its niche is largely defined by its role as a family companion, requiring regular exercise and mental stimulation.