Reference for Bava Metzia 64:13

אי הכי אפילו רישא נמי רישא בחמר עובד כוכבים סיפא בחמר ישראל מאי פסקת סתמא דמלתא איניש בתר חמריה אזיל

Now, if you say that [relieving] the suffering of an animal is a Biblical injunction, it is well; for that reason he must busy himself therewith as with one belonging to an Israelite. But if you say that [relieving] the suffering of an animal is not Biblically enjoined, why must he busy himself therewith as with an Israelite's animal? — There it is on account of enmity.<span class="x" onmousemove="('comment',' I.e., in order not to arouse the enmity of the heathen. ');">¹²</span>

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