2. "Thou who passest on this path, If haply thou dost mark this monument, Laugh not, I pray thee, though it is a dog's grave. Tears fell for me, and the dust was heaped above me By a master's hand." (Source)
In an age before pet cemeteries, Greek and Romans would bury their pets along the roadside in marked graves like this one -- a mournful gesture they did not take lightly.
3. "My eyes were wet with tears, our little dog, when I bore thee (to the grave)... So, Patricus, never again shall thou give me a thousand kisses. Never canst thou be contentedly in my lap. In sadness have I buried thee, and thou deservist. In a resting place of marble, I have put thee for all time by the side of my shade. In thy qualities, sagacious thou wert like a human being. Ah, me! What a loved companion have we lost!" (Source)
This text was found on the tombstone of Patricus, an Italian dog, written by his grieving owner. Note that, even in this era, pets were being likened to humans.