Chi's Sweet Home Vol 3

Chi has made a new friend. There's another cat in the neighborhood; the very cat that the building manager considers to be a nuisance and with a reward on his head. The cat's name is Kuro; a giant of a feline. All black and with a bit of an appetite, this cat has been known to not only sneak into people's yards but he has even been bold enough to enter some apartments searching for food. Now the two cats are working together to take on the big world outside of the Yamada's apartment!

Source: Anime News Network Encyclopedia