I think you’re misreading that line. He was pretty clearly talking about how a dog is always honest and forward with its master. Lying to others, especially one’s enemies, for advantage doesn’t really conflict with that.
(a) Nobody was misreading anything; the essay was a reaction to a common fandom statement about Sandor that is partially based on that line
(b) Considering that one of the time Sandor lies is explicitly to his master — when he backs up Sansa’s lies to Joffrey about how killing someone on your birthday is bad luck — I’m afraid I think your interpretation is a bit flawed. Furthermore, I don’t think the ferrymen at Lord Harroway’s Town can really be considered “enemies”. But either way, Sandor is not a dog, he’s a person.
this had severely tested my rule of not getting into arguments on the internet, thank you, mindset *___*