I must record my sister's Border Terrier having a play-fight with her female cat. The fights look quite alarming but the animals are definitely playing. The cat biffs the dog's snout with her paws but doesn't unsheath her claws, and he snaps at her but his jaws are always at least a few inches from her, clacking like castanets! Eventually, one of the pets gets bored and goes to lie down somewhere. Invariably, the other will then sneak up and pounce to restart the play-fight ...