Conflicts arise between cats and dogs because they see the world differently. "The cat tries to get away, the dog thinks the cat is inviting it to a game, and so chase ensues with neither party understanding what the motivation of the other one is," says anthrozoologist John Bradshaw. When they do get along, however, it's best friends forever! From comforting each other in an hour of need to sleeping and playing together - these animal friendships between dogs and cats are more adorable than ever.