My Chihuahua is also very intelligent. I have watched her solve problems and I am sure that she often understands me better than my linguistically gifted teenager, and certainly communicates better.

I have had multiple dogs of my own and currently have A Belgian Malinois who is the smartest dog I have ever encountered. My deceased Lab/Greyhound mix being the second and a Yellow Lab I had as a kid being the third. The Malinois actually can identify different toys by name and can anticipate my PTSD triggers before I have issues. She is truly amazing.

Cool...

Having had the pleasure of being pals with a very sharp doberman, I'm glad to see them ranked. he was the smartest dog I've seen.
And, I knew it when he got his tag from the town.
He's long gone, I still have the tag.

My Cane Corso is very smart. She is very obedient, and learns so fast. She is also a sweetie pie.

Mutts, Hienz 57n's, and if we were able to communicate with them we would know more. I never could understand Pavlov and his contributions to Psychology. Why are Turkeys, Pigs,Coyotes and Elephants also ranked as being smart.

I don't think I would want dogs smarter than my corgis. I have been around some in that top tier and they vibrate with intention at rest

I have never owned a terrier but I am suprised they didnt rate

Her Royal Cuteness is half German Shepherd, half pitbull.
So, she's pretty smart, and she's pretty stubborn.
When she was younger, she'd do everything I had trained her to do.
Now, she can still do what she's been trained to do, but only when
she freakin' feels like it. She's gotten old and grumpy, like her mama.
Neither of us do anything we don't feel like doing.

I've had some fairly smart cats but I prefer to rate them either on the lovey/affectionate or goofball/knucklehead scales.