From dogheirs.com:

A 500-pound lion named Bonedigger is best friends with Milo, a Dachshund. Bonedigger first met Milo and three other Dachshund puppies five years ago when he was just 4 weeks old.

The pups seemed to instinctively know that Bonnedigger was mildly disabled (he suffers from a metabolic bone disease), and they wanted to protect him, according to Joe Schreibvogel of the G.W. Exotic Animal Park in Wynnewood, Oklahoma.

Here's the puppy playing "dentist":

I never thought I'd live to see a puppy tongue-kiss a lion.

Photos and more videos here!