Answer

You can say something simple, respectful, and compassionate:

“I’m very sorry for your loss. I’m keeping you and your family in my thoughts. May their soul find peace and move onward peacefully.”

If you want to keep it especially suitable for a Jain family, you may say:

“I’m so sorry for your loss. May their soul attain peace and a higher spiritual journey.”

Explanation

In Jain Dharma, the soul is considered eternal, and death is understood as the soul leaving one body and continuing its journey according to karma. So it is respectful to speak in terms of peace for the soul and support for the family.

You do not need to say anything very religious. A kind, gentle message is enough.

What to Avoid

• Avoid saying “they are in heaven” unless you know the family uses that language.
• Avoid overly dramatic expressions.
• Avoid saying “everything happens for a reason.”

Takeaway

As their dog walker, your role is simply to show kindness. A sincere “I’m sorry for your loss” with a respectful wish for the soul’s peace is appropriate.