My current dog is practically a genius by comparison. She understands complex instructions (“go outside and go potty and then let’s go to bed” - and off she goes!)
Amazing the breadth of comprehension and intelligence from dog to dog.
The mom is not great with coming when asked, never has been. Her kids though, as soon as I whistle a certain way they show up and sit in front of me. Generally they are really good at following instructions, perhaps it's because the father is a working dog.
My current dog (the smart one) appears to be a miniature pincher / Chihuahua mix. Hard to say for sure since we rescued her off the street.