This following answer explain why muslims do not eat pork and a few other things
The talk a about dead animals is in my understanding of animals died of sickness, or dead animals you find in the forest.
Eating Pork is forbidden in the Quran
The Quran prohibits the consumption of pork in many verses including: 2:173, 5:3, 6:145 and 16:115.
"He has only forbidden to you dead animals, blood, the flesh of swine, and that which has been dedicated to other than Allah". (Al Baqara 2:173)
"Prohibited to you are dead animals, blood, the flesh of swine, and that which has been dedicated to other than Allah , and [those animals] killed by strangling or by a violent blow or by a head-long fall or by the goring of horns, and those from which a wild animal has eaten, except what you [are able to] slaughter [before its death], and those which are sacrificed on stone altars, and [prohibited is] that you seek decision through divining arrows. That is grave disobedience". (Al-Mā'idah 5:3)
Say, "I do not find within that which was revealed to me [anything] forbidden to one who would eat it unless it be a dead animal or blood spilled out or the flesh of swine - for indeed, it is impure - or it be [that slaughtered in] disobedience, dedicated to other than Allah" (Al-'An`ām 6:145).
"He has only forbidden to you dead animals, blood, the flesh of swine, and that which has been dedicated to other than Allah". (An-Naĥl 16:115)
The above verses of the Holy Quran are sufficient to satisfy Muslims as to why pork is forbidden and that any prohibition in the holy book is ultimately for their own good.
Further, Pigs have NO neck that makes it impossible to be slaughtered the Islamic way (The Halaal way) by the insertion of a knife in the neck and thus getting rid of the blood, which contains an abundance of uric acid, a toxic chemical substance that can be injurious to human health