It should be clear that feeding cats or animals with unlawful meat or other things is permissible, as long as there will be no harm inflicted on the animals because of this food.
The prominent Muslim scholar, Sheikh Yusuf Al-Qasim states: “It is permissible to feed house pets with meat that has not been properly slaughtered. They may also be given food that is deemed impure in Islamic Law provided that there is no risk of that food harming the animal.
In the Hanafi book Bada’i` As—Sana’i` (1/78), we read: “Imam Abu Hanifah holds the opinion that it is permissible to feed dogs’ dough made of flour which is mixed with impure water. This is because whatever becomes impure is unlawful for human consumption, but it may still be utilized.”
This is the opinion held by most prominent scholars. It is related by Ibn `Umar that while on a journey with the Prophet (peace and blessings be upon him), the people stopped to rest in the land of Thamud (Hijr). They took water from its well and made dough with this water. However, the Prophet (peace and blessings be upon him) ordered them to pour out the water and feed the dough to their camels” (Al-Bukhari and Muslim).
Scholars cite the above narration as evidence that it is permissible to feed things to animals that are not permitted in Islamic Law for human consumption.’