Never had a sneaky dog?
Dogs will lie to you if they think they can get away with it.
Oh I got one of those right now.
Petunia, a pure breed Rat Shepherd.
She is as sneaky as a white ninja in snow and as honest as the day is long.
I had one very smart, very honest one, and one very stupid, very sneaky one.
The smart one was dominant, but would let the sneak creep up and steal his food all the time (indulgent noblesse oblige) - unless it was a real bone with marrow and blood.
Then he had the bigger dog on his back, with the smaller dog’s teeth around the stupid one’s throat, replete with very menacing growling.
The stupe never learned. It was highly entertaining to watch.