He has no problem chasing her now that she's in front of him and he lets out a yelping, happy sound as he bounds forward to catch her. She's fast, fast as any wolf, and he runs close at her heels managing to brush the back of her flying legs once or twice with his nose. Just to let her know he's there and he's not about to let her get away. Birds scare up from the nearby grass as they bolt past. Eventually the two of them will have to stop - but like so many things it will depend on Ami. She's the one in the lead and the only way Cloud could stop her would be to tackle her. He's not interested in hurting her though. He will however chase her to the very end of the world as long as she keeps running and again, his nose taps the back of a passing calf to show it.