Anchor: A dark brown dog wearing a yellow harness is jumping over a hurdle in an agility competition.
Entailed: a brown dog wearing a yellow harness jumps over a hurdle for a competition
Contradiction: a black cat jumps over a tree branch
Contradiction: The magazine has lowered prices to invite more interesting ads.
Contradiction: Three small children are playing with toys.
Contradiction: I highly doubt this.  
Contradiction: Two guys sit in a vehicle.