Anchor: a dog chases another dog with a toy in its mouth.
Entailed: A dog has a toy in its mouth.
Contradiction: One of the dogs has a edible hot dog in its mouth.
Contradiction: Hospitals and other related institutions do not have standard guidelines in doing things. 
Contradiction: A woman is carrying a bright purse.
Contradiction: A lot of people are studying in the library.
Contradiction: Men are shaking hands.