Original: A curious Vixen Cub (usually sung by a young girl), inquisitively chases a frog right into the lap of the surprised forester who forcibly takes the vixen home as a pet. Time passes (in the form of an orchestral interlude) and we see the Vixen, now grown to a young adult (and sung by a soprano), tied up in the forester's yard with the conservative old dachshund.
Simplified: Nearby a young vixen (here, vixen means baby fox) is playing.