Manava Dharmashastra 4.115

4.115

gomāyuḥ śṛgālaḥ | tasya virutaṃ śabdakaraṇam | śvakharoṣṭrāṇāṃ paṅktyavasthitānāṃ śabdaṃ kurvatāmanadhyāyaḥ | ekaikasya samānajātīyapaṅktau |

Medhātithi’s commentary (manubhāṣya):
‘Gomāyu’—is the jackal; the ‘howling’ of the jackal is its crying.

It is time unfit for study only when dogs, donkeys and camels are crying together in large numbers; each of these three crying along with others of the same species.—(115).