Large Rats is an Enemy in Dark Souls.
Large Rats Information
Comes in three different sizes: small, large, and nightmare-inducing size. They are often seen attacking the player in groups. These vermin are likely affected by the curse and are seen attacking players in groups. The big rat has an axe lodged in its left eye, from an earlier encounter, and is most likely blind. Rats come in various sizes, with their HP linked directly to their stature. They can inflict poison extremely quickly when attacking in large groups
Block the normal rats' attacks with a shield, then counter quickly. Spears are very efficient, as is a weapon with a wide swing radius such as a claymore which handles groups of rats easily.