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Fatwa CenterAnimal By-Products Business
Question
What do you say about animal by-products business according to Al-Qur'an? I am doing animal products business. I would like know about business in (Animal by-products), including all parts of Halal animals. Some medicine companies use animal by-products for dog food and Haram animal like natural casings. Western people like use beef guts used in pork meat like puffs. Please give me Shari'a Fatwa from Qur'an and Hadith about animal by-products like penis, dried guts, blood, omasums, stomach, trakia other (All parts of Halal animals) beef, sheep and goat. Give me detailed information for doing Halal business for under Islamic Law in animal by-products. Can we do export business for dogs and Haram animal?
Answer
All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad 
is His slave and Messenger.
Your question covers two points:
A - Ruling on such products.
B - Ruling of selling such products to the one who feeds dogs, pigs or the like.
To answer the first point, production of such food is permissible as long as it does not contain anything that is forbidden to be sold in Islamic Sharee'ah, such as blood.
Imam Ibn Hajar 
reported that 'All the Muslim scholars have agreed that selling blood is forbidden.'
As for the second point, selling such products to those who feed dogs, cats and other venerable animals, is permissible since feeding such animals is required in the Sharee'ah. If one keeps the animals, having them is forbidden in the Sharee’ah (e.g. dogs) because he will bear the sin. Selling products to feed pigs is forbidden since pigs are despicable and the Sharee'ah wants them to be killed.
Allah knows best.
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