Premise: A small white dog stands on one leg to catch a ball.

Hypothesis: A small dog stands on one leg to catch a ball because he lost the other leg during the Vietnam War when he was a sergeant and commanded his entire platoon.
Relation: contradiction

Hypothesis: A small dog is trying to catch a ball.
Relation: entailment

Hypothesis: A small dog stands on one leg to catch a ball because he lost the other leg due to an accident.
Relation: neutral