Leprosy -
To teach when it is unclean, and when it is clean: this is the law of leprosy. (Leviticus 14.57)
Lev:11:8: Of their flesh shall ye not eat, and their carcase shall ye not touch; they are unclean to you. Lev:11:7: And the swine, though he divide the hoof, and be clovenfooted, yet he cheweth not the cud; he is unclean to you. Unclean in the bible usually refers to what is unhealthy or outright harmful. Compare the following verses in which the word unclean appears: Lev:13:8: And if the priest see that, behold, the scab spreadeth in the skin, then the priest shall pronounce him unclean: it is a leprosy. Lev:13:27: And the priest shall look upon him the seventh day: and if it be spread much abroad in the skin, then the priest shall pronounce him unclean: it is the plague of leprosy. Unclean here refers to leprosy, a deadly disease. God categorizes the eating of unclean foods with a deadly disease, or in other words something to be avoided to save one's life.
unclean; which equal a likely cause of disease.
because it says in Leviticus in the Bible that it is an unclean meat and not to eat unclean meats :)
Lev:11:6: And the hare, because he cheweth the cud, but divideth not the hoof; he is unclean unto you.
The Bible doesn't mention ducks specifically. While Leviticus 20:25 says that birds which move along the ground are unclean, ducks were not native to Israel. Unclean birds generally refers to scavengers.
Unhygienic means that unclean and constituting a likely cause of disease.
Pig was one of the animals considererd unclean.
Leviticus 12-15
Dogs in the Bible were unclean animals. I am no dream interpreter, but maybe it means something about getting rid of unclean things in your life?
If you are referring to the "food law" that is described in the bible for Christianity, then any animal that has a "hoof" is considered to be unclean. For example: pigs, cows, or deer. Hope this helped :)
Much of what was called leprosy in the Old Testament most likely was not the same disease.
Pigs were considered unclean and not suitable for sacrifice or human consumption.