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We dont know 100%, we speculate on the matter. personally animals have self-awareness but to what level/degree i dont know
B'COZ THEY ARE SO,,, THERE ACTIVITIES SHOWS THERE REAL BRAIN AWARENESS & SELF consciousness..........THAT'S THE THE REGION BEHIND IT;;;;;;;;;;;;;;;;;;;;;
The much respected "Molecular Cell Biology" by Lodish et. al. starts with the statement of how our increasing appreciation of the biologic similarities between human and other animal brains will change how we perceive their thoughts and emotions. And less recently, Leonardo Di Vinci wrote, "We will one day look on the murder of animals as we currently see the murder of a man."
The short answer is, it is extremely unlikely that humans are the only animals who are sentient and self aware.
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It also depends on ancestors from we have originated.... Conditions and requirements for our survival are the main reasons due to which our cranial capacity increase and now we are the most intelligent and aware organism on Earth.