Anchor: Muzzled greyhounds are racing on the track.
Entailed: Dogs race on the track.
Contradiction: Muzzled greyhouds are eating Kibbles 'N Bits out of a cereal bowl.
Contradiction: greyhounds are chowing down some dinner before a nice nap
Contradiction: The dog runs across the lava
Contradiction: The herbal extract is good at treating mild dementia.  
Contradiction: Nobody is sitting