Cat Rick Sanchez is an alternative version of Rick from a dimension where humans are cat-people, he appearaed briefly in the backround in Rick and Morty Issue 22, he is the father of Cat Beth, and the maternal grandfather of Cat Morty.
Cat Rick shares height, hair style and color, monobrow, uniform and attitude with most other Rick guards at the Citadel, but he doesn not wear shoes. He has grey fur (though white around the mouth), large cat-ears and paws for feet.
Cat Rick was sent with a group of other Ricks by the Council of Ricks to apprehend Doofus Jerry after he beat up Rick Sanchez. This caused Doofus Jerry to wonder about how many other dimensions before Cat Rick and another Rick hauled him through their portal.
At the Citadel of Ricks, Cat Rick found it amusing when another Rick told them about the last time a Jerry walked into the Genetic Restructurer and came out with two butts. This amusement was short lasted when Doofus Jerry exited the Genetic Restructurer and had altered his pheromones to be particularly poisonous to Ricks, killing a lot of the Ricks in the courtroom, Cat Rick fortunately survives, and returns to home with his daughter and grandson.