Anchor: a black dog is standing on a step next to a river as it shakes itself dry.
Entailed: A dog is standing next to a river.
Contradiction: The black dog is dry, and is about to jump into the river to become wet.
Contradiction: The dog is dry.
Contradiction: A cat is swimming.
Contradiction: The dog is snoring on it's bed.
Contradiction: The dog is sleeping on the couch.