A Little Yellow Ball

She has these little fuzzy yellow tennis balls that are a good size for her and she loves to chase them.  We throw them and she takes off at 90 miles an hour.  CRASH...she trips on her paws...gets right back up...CRASH...she runs smack into the wall...gets right back up...scoops up the ball in her mouth and takes off at 90 miles an hour in the other direction...CRASH...she trips on her paws...CRASH...she runs smack into the other wall.  Silly puppy.