The Gull Terr have been developed by crossing Bullterriers from England with local Bully Kutta varieties, producing a smaller and more agile dog than the Bully Kutta. The Gull Terr is often used to fight in pairs against a huge bear, but also in the legally arranged dogfights.
The Gull Terr is much smaller than the Bully Kutta, and shows more of the Bull Terrier blood in its conformation.
Even if they have more or less the same origin, the Gull Terr and the Indian Bull Terrier differs so much that it would be logical to separate them at their own two pages, but since the Gull Terr sprung from the Indian Bull Terrier, with infusion of Bully Kutta blood, the two breeds shares these pages for the time being.

Picture from Adeeb Razzaq.