Cats are smarter and more capable of doing difficult assignments than most people are aware of. It's a problem though, because even though their smart they're also very hard to train and are much less loyal and dependent then dogs. Some people compare cats to women lol, the way they're much more emotional, frequently mood-changing and unpredictable than men (dogs).
This I believe is a good thing. All you have to do is feed them and clean the litter box once a day and cats will love you. Dogs you have to walk multiple times a day and you have to bathe them every so often. Cats are definitely easier to take care of.
Cats are smarter than dogs. You can train dogs, but not cats. Hell, cats sometimes train you. Which proves their intelligence.
I also have a story about one of my cats. In my previous house, my family kept the cats in the basement and because the house on a hill, the basement had a door to the outside. Thus, they were given a pet door so they could come and go as they please. Which meant they would usually go to the bathroom into the woods rather than use the litter box. However, the door from the basement to the house had a handle instead of a nob. The cats would always try to get into the main house. They would always be waiting at the top of the basement stairs. One day, my family and I hear a strange sound in the house. We realize that it's coming from the basement door which was open at that point, and saw that the cat was in the house.
Apparently, she had watched us turn the handle down to open the door, which opened into the house, and learned how to open the door. She would jump up, force her weight against the door, and push down on the handle with her paws. I shit you not. She was able to get into the house on her own. My dad actually had to take a wood board and cut out a piece so that it would fit in such a way that while it was in place, you couldn't push the door handle down. But still, to learn how to open a door just by watching my family and me is amazing.
I doubt a DOG could ever accomplish such a feat. Which proves that dogs are dumb and cats are smart.