Go acquaint yourself with a German Shepherd.
Have been around them most of my life. They learn well if you teach them well.
Had a Labrador that was the stupidest thing of four legs..........
“Go acquaint yourself with a German Shepherd.”
But she still eats her own crap AND gleefully slurps up her own puke. That really has to make you question the intelligence of ANY animal.
WRT cats, I have observed them for many decades (never had one except for a few days, both my father and my wife were/are highly allergic). They are solitary hunters, and in my opinion that makes them very intelligent by necessity. That they don’t pay any attention to us, and yet we still feed and otherwise care for them, is indicative of their superior intelligence. Of course, that doesn’t stop 98% of them from being total assholes.