"Man's nest friend" is apparently a saying that applies to big cats too. Everyone knows that dogs are so ridiculously friendly. It's one of the things that they are the most known for, actually. Man's best friend.
Tiny lion cub who was abandoned by his mother gets paired up with the sweetest Labrador foster mom, and the two become instant best friends: ‘She looked at [the cub] and didn’t see a lion, she saw one of hers’