Reference for Chullin 105:37

והא כי אתא רב דימי אמר

If there was a doubt whether [an animal had been clawed] by a dog or by a cat, we may assume that it was a dog.<span class="x" onmousemove="('comment',' The clawing of a dog being of no consequence (supra) , the animal is permitted.');">¹³</span>

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