Reference for Pesachim 44:3
שאני אבר מן החי דאיתקש לדם דכתיב (דברים יב, כג) רק חזק לבלתי אכול הדם כי הדם הוא הנפש
R'Nathan said: How do we know that a man must not hold out a cup of wine to a nazirite or the limb of a living animal to the children of Noah?<span class="x" onmousemove="('comment',' The technical designation for all but Jews. A nazirite must not drink wine, nor may non-Jews eat of the limb of a living animal.');"><sup>3</sup></span> Because it is stated, thou shalt not put a stumbling-block before the blind.<span class="x" onmousemove="('comment',' Lev. XIX. 14. This is understood metaphorically: do not lead anyone to sin.');"><sup>4</sup></span> This implies that [giving] to dogs is permitted?<span class="x" onmousemove="('comment',' Though this is benefit.');"><sup>5</sup></span>