You can choose, but for me it´s so clear!

My point of view:

“SHE” FOR ANIMALS… IF YOU LOVE THEM!

When the animal’s sex doesn’t matter and we have no personal relationship with it, we use “it”. Note, however, that it is customary to refer to all animals as “he” or “she” in certain circles, especially among animal rights activists.

Nevertheless, most people would use “he” or “she” (depending on the sex of the animal) only when referring to an animal with whom they have a close personal relationship:

correctThat dog dachshund is a member of our family. She is so curious.

correctThat dog is a member of our family. It is so curious.

Both examples are grammatically correct, but the first one sounds more affectionate.

“SHE” FOR THINGS… IF YOU LOVE THEM AS WELL!

Sometimes things are referred to as “she” to show affection. It is traditional for ships to be a “she”:

What a ship! She’s been cruising the sea for fifty years and still looks like new.

Nevertheless, it is not wrong to refer to a ship in an impersonal manner as “it”. Similarly, countries and cars are sometimes referred to as “she”:

correctI love Great Britain. She is a great country. (affectionate)

correctLet’s try out our new Ferrari. She’s ready for it. (affectionate)

However, don’t overdo it. Even if you really love your Ferrari, referring to it always as “she” may make you sound pretentious or snobbish (if the mere fact that you have a Ferrari didn’t do the job). 

ANOTHER POINT OF VIEW…

Gendered pronouns! Feminist linguists (of both sexes, mind you) tell us that the proper way to say "A mother wants her child to be a successful adult" is "A mother wants their child to be a successful adult". According o these linguists, it's nonsexist and we can't guess that the mother is actually female. She may be an amoeba or a piece of plankton.