For ten years he has to live as a monkey, and after that for five years as a mouse. After that he is born as a dog, and living in that form for six months he succeeds in regaining his human form.
वानरो दश वर्षाणि पञ्च वर्षाणि मूषिकः। श्वाथ भूत्वा तु षण्मा सांस्ततो जायति मानुषः॥