premise: Two horses greet a man in red pants and a black shirt, while a dog on a leash attempts to jump the fence. hypothesis: A man dressed in red and black says hello to two horses while his dog tries to jump over the fence.
entailment: A meeting is a two-way interaction.  If a man meets a pair of horses, then the horses must also meet the man. As for the dog, it is implied that the dog is owned by the man because the dog is on a leash, which is a sign of ownership.