Śatapatha Brāhmaṇa ("of a hundred paths") 13.3.8.2

13.3.8.2

atha yadi srāmo vindet pauṣṇaṃ carumanunirvapetpūṣā vai paśūnāmīṣṭe sa yasyaiva paśavo yaḥ paśūnāmīṣṭe tamevaitatprīṇātyagado haiva bhavati

And if disease were to befal it, let him in addition prepare a pap to Pûshan, for Pûshan rules over beasts (cattle); and, indeed, he thereby gratifies him who owns cattle and rules over cattle; and it (the horse) thereby indeed becomes free from disease.