In Jain Dharma, the answer depends on how seriously you want to practice ahiṁsā (non‑violence).

1. What do śāstras and tradition say?

• Traditionally, milk and its products were allowed for householders (śrāvaks), if:

- The cow is treated with care and not harmed. - Calf is fed first; only surplus milk is taken. - Milk is boiled, filtered, and taken in the day, with care (apramatta). ( jainknowledge.com)

• For monks and very strict practitioners, dairy is generally avoided, because it is an animal product and easily involves hiṁsā. ( jainknowledge.com)

2. Situation today (modern dairy)

• In today’s commercial dairy:

- Cows are repeatedly made pregnant, - Calves are often separated, - “Unproductive” cows/buffaloes are sold for slaughter.

• Because of this, many Jains now see milk as himsāk (violent) and are moving towards vegan (plant‑based) diets. ( jainknowledge.com)

3. So, should you drink milk? From a Jain point of view:

• Best (highest ahiṁsā):

Avoid milk and all dairy; use plant milks (soy, almond, oat, etc.). This matches the ideal of minimizing violence to all jīvas. ( jainknowledge.com)

• If you still choose to take milk:

- Try to get it only from genuinely cruelty‑free sources (if available). - Use it sparingly, not as luxury or habit. - Always remember: it is “allowed” for householders, not compulsory, and moving away from it is considered a spiritual improvement, not a loss. ( jainknowledge.com)

In simple words:

• Scripturally, milk was permitted for lay Jains when taken very carefully.
• Looking at today’s cruelty, avoiding milk is more in line with true Jain ahiṁsā.

You can read a concise discussion on milk in Jainism here