Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 31

Sanskrit:

पुनरासाद्य संरब्ध उपक्रोष्टा पराक् स्थित: ।चरणावपरौ राजन् बलाय प्राक्षिपद् रुषा ॥ ३१ ॥

ITRANS:

punar āsādya saṁrabdhaupakroṣṭā parāk sthitaḥcaraṇāv aparau rājanbalāya prākṣipad ruṣā

Translation:

Moving again toward Lord Balarāma, O King, the furious ass situated himself with his back toward the Lord. Then, screaming in rage, the demon hurled his two hind legs at Him.

Purport:

The word upakroṣṭā indicates an ass and also one who is crying out nearby. Thus it is indicated herein that the powerful Dhenuka made horrible, angry sounds.