Are dolphins cleverer than dogs?
bbc.com
bbc.com
An easy (although not necessarily correct) way to define intelligence could just be the ability to learn, although even this can be hard to define. Some animals can learn fast, while others have a larger space in their memory. As was pointed out, dogs are able to learn significantly more words and more complex phrasing than other animals, but at the same time they have been conditioned for a very very long time to understand human voices, dolphins much less so.
Dolphins are in a completely different environment, which results in completely different conditioning. Perhaps the reason they seem similar to us is because they are in a similar place in their environment. They're fairly independent species, not relying too heavily on other species, or being heavily preyed on by other animals. This could allow their brains to evolve in a similar way to ours, which aligns with our definition of intelligence.
Most scent hounds are perfect examples of this. They never have high representations at obedience competitions, but put an obstacle between them and what they are tracking, and you will see amazing problem solving skills.
At home I have a rottweiler(ruby) and she is really smart and obedient. She is driven by life. If that makes sense. My brother a has a doberman and the dogs hang out all day every day, but the doberman is driven by food. When we used to have the doberman at the junk yard she would run around through broken glass and other stuff and always be fine. I can teach both dogs any trick in the world, but the doberman has this innate unexplainable overriding intelligence through problem solving. It's pretty cool.
Once, the dog missed dropping the object in the barrel--and then picked it up and did it again, this time getting it in the barrel. That dog knew he was performing a certain task, and not just an action. That's stuck with me as a pretty impressive feat of canine cognition.
According to what source? What are chimpanzees, chopped liver?
The article was quite long. I may be interested in reading it, but I didn't have time (actual work and life stuff to do, you know). However if I can read an abstract of the study (or at least a TLDR) I can get the info and decide whether I want to read the full article.
Also the sentences that either contain bold words or are offset make a pretty good TL;DR.
But again, three pages; the article's already a short summary of several pieces of research.
(Don't get so upset about people downvoting a non-contributing comment. It's not personal.)