Short answer: No. During Paryushan/Das‑Lakshan, curd (yogurt) is to be avoided.

Reason (in simple words):

• Paryushan is a time to minimize himsa in food.
• Curd is a fermented item containing innumerable living microorganisms; Jain acharyas advise giving up all fermented foods in these days.
• Along with curd, buttermilk, lassi, and other yogurt‑based preparations are also avoided.
• If there is a genuine medical need, it may be taken only as aushadhi, in minimal quantity, before sunset, after proper pachchakkhān (vow) as per your Guru/paramparā.

Traditions:

• Both Śvetāmbara and Digambara practices emphasize avoiding fermented foods during this period. Local household practices can vary, but the recommended discipline is complete avoidance.