Augustine of Hippo

Likewise, in the same psalm, where it says, "the tongue of your dogs from the enemies by the same," dogs should not always be taken in an evil sense, otherwise the prophet would not blame "dogs not able to bark and loving to dream": 18 doubtless they would be praiseworthy dogs if they both knew how to bark and loved to watch. …

Letter 149 ↗

Jerome

That your foot may be dipped in blood. Because his own foot was dipped in his own blood. "I have trodden the winepress alone, and of the nations there was no man with me." And again: "Who is this who ascends from Edom? his garments red from Bosor." Edom is interpreted "blood," Bosor "flesh": it signifies our Lord himself crucified. The tongue of your dogs from the enemies, from him. …

Homily 7, on Psalm 67 ↗

Gregory the Dialogist

But on the other hand, dogs licked the wounds of the poor man lying there. Sometimes in sacred speech preachers are understood by dogs. For the tongue of a dog, when it licks a wound, heals it, because holy teachers too, when they instruct us in the confession of our sin, touch as it were the wound of the mind through their tongue; and because by speaking they rescue us from sins, by touching wounds as it were they restore us to health. …

Forty Gospel Homilies, Homily 40 ↗