13:45 - 2017/12/10
The leftover of a dog, a pig and a kafir, is najis and it is haraam to consume it.
The leftover of a dog, a pig and a kafir, other than the people of the Book is najis, and as a recommended precaution, the leftover of the people of the Book is also najis, and it is haraam to consume it. However, the leftover of the animals, whose meat is haraam, is Pak, and with the exception of cat, it is Makrooh to eat or drink the leftover of such animals.
1. Ayatollah Seyyed Ali Sistani, Islamic Laws, Taharat, Rules Regarding Waters, 56.