Cats rule:

Jaguar

2000 psi

http://listverse.com/2012/11/05/top-10-a...

Mastiff

Many breeders say that the Mastiff has the strongest jaw. Reportedly, the Mastiff has a bite force of 552 pounds. If true, this would make it stronger than any other domesticated dog on record.

http://dogs.lovetoknow.com/wiki/Which_Do...