Glossarium Italioticum 220 Kassel-Austin has this and related material.
[1] Demosthenes 18.242, referring to Philip II (web address 1).
[2] Hence the gloss in kappa 1628.
[3] "A kind of beast... like a fox" is taken from the scholia vetera to Aristophanes, Clouds 448-9 (web address 2). The last phrase is cited as a saying: "particularly the fox. For [one is] "evil-doing", as they say, "like a fox". The saying is cited to explain the negative associations of ki/nados within cunning. It may originate in Aristotle, History of Animals 488b: "and some animals are cunning and evil-doing, like the fox, while others are high-spirited, friendly, and fawning, like the dog." But as a stereotype, it is fairly obvious, and it also occurs in Harpocration: see below.
[4] "They claim that... call the fox kinadion" is from Harpocration s.v., which like the present entry is initially generated by Demosthenes 18; note, however, that Photius corrupts Harpok.'s u(pe\r *kthsifw=ntos into kata\ *kthsifw=ntos, thereby creating a non-existent speech and a false connection with Aeschines 3.167 (web address 3). The scholiast to Aristophanes has the correct reference.