It's sounds crazy, but this Dachshund or wiener dog licks and cleans the mouth of an enormous lion at The Garold Wayne Interactive Zoological Park on a daily bases. They are buddies.  There are many creatures in animal kingdom that shouldn't get along, but they do.  I have compiled this list of YouTube videos of some of my favorites.

Dog & Elephant

Deer & Cat

Dog & One-Legged Chicken

Dog & Albino Tiger Cubs

Snake & Hampster