“Dugar” is a Jain baniya community surname, and Terapanth is a Śvetāmbara Jain sect, not a caste.

In simple terms:

• Many people with the surname Dugar are Śvetāmbara Jains.
• Among them, some follow Terapanth (Jain Śvetāmbara Terapanth Sampradāy), some follow other Śvetāmbara paths (like Sthānakvāsī, Mūrtipūjak, etc.).
• So:

If you are asking, “Is Dugar allowed / accepted in Terapanth?” – yes, Dugar families who follow Terapanth are fully part of the Terapanth Jain community, like any other Terapanthi Jain.

If you want a short basic explanation of what Terapanth is, you can read more here: