Cats are infamous for being curious but if you spend a few hours with a dog, especially a young one, it is clear that they are curious too. They’re just curious about different things. Cats are curious about their environment. Dogs are curious about people and the things people do.
By the way, I wonder if introverts are more likely to be cat people and extroverts are more likely to be dog people. It makes sense to me because cats spend much of the time doing their own thing and are usually happy to leave you alone, while dogs are naturally pack animals and want to be with you all the time.