Water waves

He lowered himself again into the shallow water, and a great shudder made eddies around him. His short tail wagged out behind him. He edged himself further forward and slapped the water his paws. She was afraid for a moment that he would pull away, but no, when he reached the end of his chain he backed up, relaxed. Impulsively, she scooped water with her hands and poured it over him. He shook and shuddered. She could have crowed. (Bear, Chap. VIII, p. 38).