You really need to ask the dogs on that. If it is a smart dog he'll probably tell you that smart dogs keep on learning but there are some real dummies out there and you can't teach a thing to them.
I had this one dog that would obey my every command except running around with 10' sticks in his mouth. Why he did it I can't figure out. he would race by me but I'd never get wacked. One day he decided to pull up a small tree- run around with that (we were out in the woods). Well he dug it up a little and started tugging on it and the roots held the thing fast, he couldn't pull it out. He let go of the tree and stood looking at it for maybe 30 seconds and then all of a sudden he turned his head and started looking around at the nearby trees.
"What the heck is he thinking about?" I wondered.
He then got the tree and started dragging the top over against another nearby tree where he could get some leverage and snap the tree in two, which he did- thereby getting his big stick he could run around with.
I read about a famous Texas deer hound. This particular dog (might have been a Walker) started out like all the rest but after a while he would only run a strong buck track, no does. Then he finally figured the buck always turned, he would try to figure about when and where the buck would turn and he would leave the pack and head off where he figured the buck would end up. Outstanding dog.
You hear all kinds of stuff. Some coon hounds never figure out a coon will jump from tree to tree and run off, they just keep barking up the wrong tree, other dogs figure it after a while and just sense what's going on and start circling the area to pick up the track.
I heard about a cougar dog, I think it was a plot or black and tan- can't recall. It was a pretty good tree climber and would go right up after lions.
Dogs can be "smart-alecks" as well. I had this one dog, there was a crippled person that lived nearby and when ever the dog passed this person the dog would limp along on 3 legs until past that person and then start running again. I was a kid at the time and I used to play football with the dog. We would line up across from one another and on "go" this dog would try to zig and zag by me to the right or left and I'd try to tackle the dog. This crippled person thought I had injured the dog until I told them to keep watching the dog once it was off a ways and it would start running. Unbelievable.
One big regret of my life is we now live in a world without the horse being that common. Except for giving them a lump of sugar or carrot as a kid I've never had much to do with them. My father always said a horse was smarter than a dog and I have heard of some incredible stories on how smart horses are. I'm told mules can be even smarter than a horse.
Makes you sort of wonder about half the people out there