Monkey and dog are best friends

Billy the dog disappeared during the big floods of 2002 in Caia, Mozambique.
But when he finally emerged from the jungle in 2005, he came carrying a little monkey on his back, Kiko. They were skinny and half dead, but they had made it through all these years.

Billy had defended Kiko from all the dangers of the jungle, including a bunch of savage dogs willing to have Kiko for lunch.

They are now inseparable. Kiko sleeps hugged to Billy. They eat together, do everything together, and they still are unconfident about humans...Only the two of them, forever.
via Maniacworld