Assuming the person saving the life is equally unfamiliar with both the human and the dog, I would expect them to save the human because of their "gut reaction," not because it is "reasonable to value human life more." I should expect that gut reaction to be the result of our genetic kinship.

However, assuming the other human was a stranger and the dog was the saviour's long-time friend, I would expect them to save the dog due to personal familiarity.

Personally, I don't consider either to be morally superior. 


Side note, everyone in this conversation is using the term "intrinsic valuable" incorrectly. Something which is intrinsically valuable has value without regard to any consciousness beings. More likely they mean "instrumental value."