5 interesting Facts on Dogs

1)A man may 3 times more obtain the phone number of a girl if he has a dog with him.
2)The human beings and the dogs became the best friends 30.000 years ago.
3)THE MITOCHONDRIAL DNA of every dog is 99,9 % the same as a grey wolf.
4)Dogs have 13 types of blood, horses 8, cows 9, whereas the human beings only 4.
5)Paul McCartney registered(recorded) a whistle with audible ultrasounds only for dogs at the end of " To Day in the Life ".