Dio Chrysostom, Oration 6.13
Diogenes of Sinope, the original Cynic philosopher, laments humans’ stupidity when compared to the animals.
κατεγέλα δὲ τῶν, ὁπότε διψῷεν, τὰς μὲν κρήνας παρερχομένων, ζητούντων δὲ πάντως ὁπόθεν ὠνήσονται Χῖον ἢ Λέσβιον, καὶ πολὺ ἔφασκεν ἀφρονεστέρους εἶναι τῶν βοσκημάτων· ἐκεῖνα γὰρ οὐδέποτε διψῶντα κρήνην οὐδὲ ῥεῦμα καθαρὸν παρελθεῖν οὐδὲ πεινῶντα ἀπέχεσθαι τῶν ἁπαλωτάτων φύλλων καὶ πόας τῆς ἱκανῆς τρέφειν.
He derided those men who, being thirsty, would walk past springs and search high and low for somewhere where they could buy Chian or Lesbian wine. He said they were much more foolish than cattle, as those animals never pass by a spring or a clear stream when they are thirsty, and when they are hungry do not shun the tender leaves and the grass which is enough to give them nourishment.