Musar sur L’Exode 32:30

He also brings himself to eminence in this world, as it is written in Mechilta, Parshath Mishpatim on Shemoth 32:30: "And flesh torn in the field you shall not eat. To the dog shall you throw it" — to teach us that the Holy One Blessed be He does not withhold reward from any creature, as it is written (Shemoth 11:17): "And to all the children of Israel a dog will not sharpen its tongue." Now is this not a kal vachomer [i.e., Does it not follow a fortiori]: If it is so [i.e., that He does not withhold reward] from an animal, how much more so from a human being!