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They are a completely different species and therefore communicate MUCH differently.
Not only that, but let us not forget about the history of the relationship between dog/cat and humans.
Dogs have been integrated into the human "family" since at least the days of the caveman. They were partners in hunting, scouting and self-defense. Some of the predators man and dog fended off were even of the feline classificatioin(?) - like the saber-tooth. The history is long and one of co-existence.
I'm not completely sure when and how cats became domesticated - but I'm guessing it wasn't until the Egyptian era. Although cats do live in prides, I don't think they have the same "co-operative" or "pack-like" instict that dogs have - they are quite independent by nature. Does it mean they hate us? No, just that it's not quite built into them to behave in a partnership-like way with us. When you compare them to the behavior of dogs, they come across as stuck-up, arrogant, prissy bastards (that they really are :P )
The reason cats were domesticated is not really clear to me, might have had something to do with keeping mice away. Or simply their beauty and easy maintenance. Who knows? Dogs, on the other hand, have had a natural and stronger bond in which there's a behavior of closeness there that most die-hard cat lovers mistake as being "dopey" or hyper.
I catch myself describing my dog with the stereotypical qualities of a cat all the time. She cuddles on my lap like one when watching TV (we're talking about a 45lbs. hunk of fur here!), she'll ignore me (at first) if I call her sometimes, she'll lay around on the couch stretched out all lazy-like. I literally say to her "why you being such a cat?!". If I had a cat, I bet I'd find certain times when it behaved like a dog too - we just dismiss them because we only focus on the expected behavior associated with the type of pet.