Yes, many Jains do eat curd.

However, it depends on the person’s tradition, level of observance, and personal vows.

• Householder Jains commonly consume milk, curd, buttermilk, and ghee if they follow a dairy-accepting diet.
• Some stricter Jains avoid curd because it involves fermentation and contains living microorganisms.
• Jain monks and nuns follow much stricter rules and may avoid foods depending on their discipline and tradition.
• Some modern Jains avoid dairy completely due to concerns about himsa in the dairy industry.

Takeaway

Curd is not universally forbidden for all Jains, but stricter Jains may avoid it to reduce harm to living beings.