Jemma McKenzie's collies adopted Pet, an orphaned lamb. Like Tarzan, she's taken up the ways of her new family. She wags her tail and plays like a dog. You can watch another video of them playing here.
-via Tastefully Offensive
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Our adopted lamb used to do this as well, though we didn't have a dog. He loved playing chasey with us in the field, bouncing around, all pretty normal sheep behaviour.
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