Human. Rose Tyler.
At the moment The Doctor doesn't have a companion. However his last companion was Donna Noble. In the recent Easter special 'Planet of the Dead' he had a one day conpanion Lady Christina de Souza. He doesn't want to take another companion, because of how he lost Donna and Rose. Amy Pond is the Doctor's companion at the moment.
i think it is going to be the doctors daughter.
The actress Billie Piper played the companion, Rose Tyler, in the show Doctor Who. Billie piper acted in seasons 1 and 2 as the doctor's companion. She also acted in seasons 4 and the episode called The Day Of The Doctor as bad wolf.
a cat or a goat is the best companion for a horse
Amy Pond and Rory Williams Pond.
She had a minor part in that episode long before being chosen as the 11th Doctor's companion.
Sarah Jane Smith ( Elizabeth Sladen ) The 3rd Doctor regenerated in front of Sarah Jane Smith and she was definitely a 4th doctor companion, which means she must be his first companion. Chocywhovian : ) x P
British Actress Billie Piper played the part of Rose Tyler, the Doctors Assistant.
it takes about "i-don't-know-how-long" for a rose to become a rose.
Irrevenance
No, the Doctor's most attractive companion would probably be Freema Agyeman as Martha Jones with a close second being Karen Gillan as Amy Pond. In my geekiest moment I might argue that K9 was at the best companion of all time.